Showing papers on "Absorption (electromagnetic radiation) published in 2007"
TL;DR: In this article, Nitrogen-doped TiO2 nanocatalysts with a homogeneous anatase structure were successfully synthesized through a microemulsion−hydrothermal method by using some organic compounds such as triethylamine, urea, thiourea, and hydrazine hydrate.
Abstract: Nitrogen-doped TiO2 nanocatalysts with a homogeneous anatase structure were successfully synthesized through a microemulsion−hydrothermal method by using some organic compounds such as triethylamine, urea, thiourea, and hydrazine hydrate. Analysis by Raman and X-ray photoemission spectroscopy indicated that nitrogen was doped effectively and most nitrogen dopants might be present in the chemical environment of Ti−O−N and O−Ti−N. A shift of the absorption edge to a lower energy and a stronger absorption in the visible light region were observed. The results of photodegradation or the organic pollutant rhodamine B in the visible light irradiation (λ > 420 nm) suggested that the TiO2 photocatalysts after nitrogen doping were greatly improved compared with the undoped TiO2 photocatalysts and Degussa P-25; especially the nitrogen-doped TiO2 using triathylamine as the nitrogen source showed the highest photocatalytic activity, which also showed a higher efficiency for photodecomposition of 2,4-dichlorophenol. T...
961 citations
TL;DR: New formulas providing comprehensive approximations of the optical properties of silica glass are proposed between 7 and 50 microm, which are consistent with experimental data and substantially extend the spectral range of 0.21-7 microm covered by existing formulas and can be used in various engineering applications.
Abstract: We thoroughly and critically review studies reporting the real (refractive index)
and imaginary (absorption index) parts of the complex refractive index of silica glass
over the spectral range from 30 nm to 1000 μm The general features of the optical
constants over the electromagnetic spectrum are relatively consistent throughout the
literature In particular, silica glass is effectively opaque for wavelengths shorter
than 200 nm and larger than 35-40 μm Strong absorption bands are observed (i) below
160 nm due to the interaction with electrons, absorption by impurities, and the presence
of OH groups and point defects; (ii) at ~273-285, 35, and 43 μm also caused by OH
groups; and (iii) at ~9-95, 125, and 21-23 μm due to SiOSi resonance modes of
vibration However, the actual values of the refractive and absorption indices can vary
significantly due to the glass manufacturing process, crystallinity, wavelength, and
temperature and to the presence of impurities, point defects, inclusions, and bubbles,
as well as to the experimental uncertainties and approximations in the retrieval
methods Moreover, new formulas providing comprehensive approximations of the optical
properties of silica glass are proposed between 7 and 50 μm These formulas are
consistent with experimental data and substantially extend the spectral range of 021-7
μm covered by existing formulas and can be used in various engineering applications
882 citations
TL;DR: The role of excitonic coupling on the nature of photoexcitations in the conjugated polymer regioregular poly(3-hexylthiophene) is addressed by means of temperature-dependent absorption and photoluminescence spectroscopy.
Abstract: We address the role of excitonic coupling on the nature of photoexcitations in the conjugated polymer regioregular poly(3-hexylthiophene). By means of temperature-dependent absorption and photoluminescence spectroscopy, we show that optical emission is overwhelmingly dominated by weakly coupled H aggregates. The relative absorbance of the 0-0 and 0-1 vibronic peaks provides a powerfully simple means to extract the magnitude of the intermolecular coupling energy, of approximately 5 and 30 meV for films spun from isodurene and chloroform solutions, respectively.
848 citations
TL;DR: In this paper, the features of the graphene mono-and multilayer reflectance in the far-infrared region were analyzed as a function of frequency, temperature, and carrier density taking the intraband conductance and the interband electron absorption into account.
Abstract: We analyze the features of the graphene mono- and multilayer reflectance in the far-infrared region as a function of frequency, temperature, and carrier density taking the intraband conductance and the interband electron absorption into account. The dispersion of plasmon mode of the multilayers is calculated using Maxwell's equations with the influence of retardation included. At low temperatures and high electron densities, the reflectance of multilayers as a function of frequency has the sharp downfall and the subsequent deep well due to the threshold of electron interband absorption and plasmon excitations.
842 citations
TL;DR: MEG is found in relatively large Si NCs such that the confinement energy is not large enough to produce a large blue-shift of the band gap, but the Coulomb interaction is sufficiently enhanced to produce efficient MEG.
Abstract: Multiple exciton generation (MEG) is a process whereby multiple electron-hole pairs, or excitons, are produced upon absorption of a single photon in semiconductor nanocrystals (NCs) and represents a promising route to increased solar conversion efficiencies in single-junction photovoltaic cells. We report for the first time MEG yields in colloidal Si NCs using ultrafast transient absorption spectroscopy. We find the threshold photon energy for MEG in 9.5 nm diameter Si NCs (effective band gap E g ) 1.20 eV) to be 2.4 ± 0.1Eg and find an excitonproduction quantum yield of 2.6 ± 0.2 excitons per absorbed photon at 3.4Eg. While MEG has been previously reported in direct-gap semiconductor NCs of PbSe, PbS, PbTe, CdSe, and InAs, this represents the first report of MEG within indirect-gap semiconductor NCs. Furthermore, MEG is found in relatively large Si NCs (diameter equal to about twice the Bohr radius) such that the confinement energy is not large enough to produce a large blue-shift of the band gap (only 80 meV), but the Coulomb interaction is sufficiently enhanced to produce efficient MEG. Our findings are of particular importance because Si dominates the photovoltaic solar cell industry, presents no problems regarding abundance and accessibility within the Earth’s crust, and poses no significant environmental problems regarding toxicity.
774 citations
596 citations
09 Mar 2007
482 citations
TL;DR: In this paper, the first ground-based detection of sodium absorption in the transmission spectrum of an extrasolar planet was presented, showing that the absorption due to the atmosphere of the extrasolar Planet HD189733b is detected in both lines of the NaI doublet.
Abstract: We present the first ground-based detection of sodium absorption in the transmission spectrum of an extrasolar planet. Absorption due to the atmosphere of the extrasolar planet HD189733b is detected in both lines of the NaI doublet. High spectral resolution observations were taken of eleven transits with the High Resolution Spectrograph (HRS) on the 9.2 meter Hobby-Eberly Telescope (HET). The NaI absorption in the transmission spectrum due to HD189733b is (-67.2 +/- 20.7) x 10^-5 deeper in the ``narrow'' spectral band that encompasses both lines relative to adjacent bands. The 1-sigma error includes both random and systematic errors, and the detection is >3-sigma. This amount of relative absorption in NaI for HD189733b is ~3x larger than detected for HD209458b by Charbonneau et al. (2002), and indicates these two hot-Jupiters may have significantly different atmospheric properties.
432 citations
01 Oct 2007
TL;DR: Terahertz time-domain spectroscopy is used to study properties of nonpolar amorphous materials and the results were correlated with material properties.
Abstract: Terahertz time-domain spectroscopy is used to study properties of nonpolar amorphous materials. Terahertz absorption spectra and refractive indices were measured in a number of glasses, lubricating oils, and polymers, and the results were correlated with material properties.
420 citations
TL;DR: In this article, the electromagnetic interaction between Au nanoparticles positioned atop a Si pn junction photodiode and incident electromagnetic plane waves has been performed as a function of wavelength, leading to increased electromagnetic field amplitude within the semiconductor and consequently increased photocurrent response, over a broad range of wavelengths extending upward from the nanoparticle surface plasmon polariton resonance wavelength.
Abstract: Experimental characterization and finite-element numerical simulations of the electromagnetic interaction between Au nanoparticles positioned atop a Si pn junction photodiode and incident electromagnetic plane waves have been performed as a function of wavelength. The presence of the Au nanoparticles is found to lead to increased electromagnetic field amplitude within the semiconductor, and consequently increased photocurrent response, over a broad range of wavelengths extending upward from the nanoparticle surface plasmon polariton resonance wavelength. At shorter wavelengths, a reduction in electromagnetic field amplitude and a corresponding decrease in photocurrent response in the semiconductor are observed. Numerical simulations reveal that these different behaviors are a consequence of a shift in the phase of the nanoparticle polarizability near the surface plasmon polariton wavelength, leading to interference effects within the semiconductor that vary strongly with wavelength. These observations hav...
370 citations
TL;DR: An analytical solution is provided in the case in which the density of generated carriers is relatively low; it is useful for estimating spectral bandwidth of pulses at low repetition rates.
Abstract: We study the effects of two-photon absorption on the self-phase modulation (SPM) process in silicon waveguides while including both free-carrier absorption and free-carrier dispersion An analytical solution is provided in the case in which the density of generated carriers is relatively low; it is useful for estimating spectral bandwidth of pulses at low repetition rates The free-carrier effects are studied numerically with emphasis on their role on the nonlinear phase shift and spectral broadening We also consider how the repetition rate of a pulse train affects the SPM process
TL;DR: The broadband optical absorption properties of silicon nanowire (SiNW) films fabricated on glass substrates by wet etching and chemical vapor deposition (CVD) have been measured and found to be higher than solid thin films of equivalent thickness.
Abstract: The broadband optical absorption properties of silicon nanowire (SiNW) films fabricated on glass substrates by wet etching and chemical vapor deposition (CVD) have been measured and found to be higher than solid thin films of equivalent thickness. The observed behavior is adequately explained by light scattering and light trapping though some of the observed absorption is due to a high density of surface states in the nanowires films, as evidenced by the partial reduction in high residual sub-bandgap absorption after hydrogen passivation. Finite difference time domain simulations show strong resonance within and between the nanowires in a vertically oriented array and describe the experimental absorption data well. These structures may be of interest in optical films and optoelectronic device applications.
TL;DR: The absorption spectra of seventeen explosives and related compounds (ERCs) are investigated by using terahertz time-domain spectroscopy in the 0.1-2.8 THz region to form a database of these ERCs, of great importance for biochemical, defense and security related applications.
Abstract: We have investigated the absorption spectra of seventeen explosives and related compounds (ERCs) by using terahertz time-domain spectroscopy in the 0.1-2.8 THz region. Most of these substances show characteristic absorption features in this frequency range. The measured absorption coefficients of these ERCs form a database, which is of great importance for biochemical, defense and security related applications.
TL;DR: In this article, composites of single-walled carbon nanotubes (SWNTs) with soluble cross-linked polyurethane (SCPU) were prepared at various loadings of SWNTs (0−25 wt %), and they exhibited strong microwave absorption in the microwave range of 2−18 GHz.
Abstract: Processable composites of single-walled carbon nanotubes (SWNTs) with soluble cross-linked polyurethane (SCPU) were prepared at various loadings of SWNTs (0−25 wt %), and they exhibited strong microwave absorption in the microwave range of 2−18 GHz. For example, 5 wt % loading SWNTs/SCPU composite has a strong absorbing peak at 8.8 GHz and achieves a maximum absorbing value of 22 dB. The absorbing peak position moves to lower frequencies with increasing SWNT loading. Theoretical simulation for the microwave absorption using the transmission line theory agrees well with the experimental results. The microwave absorption of these composites can be mainly attributed to the dielectric loss rather than magnetic loss.
TL;DR: Time-resolved emission experiments confirm that the solid host facilitates these sequential bimolecular reactions leading to delayed DPA fluorescence; however, these processes are notably slower than the analogous photochemistry in fluid solution.
Abstract: Noncoherent low-power photon upconversion has been realized in solid thin films composed of an ethyleneoxide/epichlorohydrin copolymer doped with palladium octaethylporphyrin (PdOEP) and 9,10-diphenylanthracene (DPA). Selective excitation of PdOEP at 544 nm generates easily visualized DPA fluorescence in the blue with noncoherent light sources under ambient laboratory conditions. The incident excitation power dependence is quadratic in nature, exemplifying that sequential one-photon absorption by PdOEP leads to the sensitization of two triplet DPA chromophores, which in turn annihilate to produce the upconverted singlet DPA fluorescence. Time-resolved emission experiments confirm that the solid host facilitates these sequential bimolecular reactions leading to delayed DPA fluorescence; however, these processes are notably slower than the analogous photochemistry in fluid solution.
TL;DR: In this article, ultraviolet and visible spectra of 200 organic compounds were examined, concluding that visible absorption may be attributable to n → π* electronic transitions in a small fraction of oxygenated compounds.
Abstract: [1] We recommend ultraviolet and visible absorption spectra to represent particular types of atmospheric organic particles. Spectra of liquids and particles can be compared using the absorption coefficient of bulk material divided by material density. Reported absorption by absorbing organic aerosol from combustion is greater than that of organic material isolated by humic acid extraction. We examine ultraviolet and visible spectra of 200 organic compounds, concluding that visible absorption may be attributable to n → π* electronic transitions in a small fraction of oxygenated compounds. Absorption spectra can be communicated using the band-gap and Urbach relationships instead of the absorption Angstrom exponent. Water-soluble atmospheric aerosol has a band-gap of about 2.5 eV; insoluble aerosol may have a lower band-gap and higher absorption. Although different types of organic carbon may exhibit a continuum in absorption, there is a sharp distinction between the most-absorbing organic carbon and black carbon.
TL;DR: In this paper, boron-doped TiO2 nanotube arrays were obtained, and the nanotubes were open at the top end with an average diameter of approximately 80 nm.
Abstract: Boron-doped TiO2 nanotube arrays were produced by forming a nanotube-like TiO2 film in an anodization process on a Ti sheet, followed by chemical vapor deposition treatment using trimethyl borate as the boron source with N2 as the carrier gas, and were characterized by ESEM, XPS, XRD, and UV−vis methods. The highly ordered vertically oriented nanotube arrays were obtained, and the nanotubes were open at the top end with an average diameter of approximately 80 nm. Analysis by XPS indicated that the introduced boron was probably incorporated into TiO2 and that the chemical environmental surrounding boron might be Ti−B−O. The boron-doped sample with a mixture of anatase and rutile was identified by X-ray diffraction. A shift of the absorption edge to a lower energy in the spectrum of the UV−vis absorption was observed. Under both UV and 400−620 nm visible light irradiation, the B-doped TiO2 nanotube array electrode exhibited a higher photoconversion efficiency than the non-doped one, a notable photoconversio...
TL;DR: The transient absorption of nanocrystalline TiO(2) films in the visible and IR wavelength regions was measured under the weak-excitation condition, where the second-order electron-hole recombination process can be ignored and prompt spatial charge separation of electrons in the bulk and holes at the surface was interpreted.
Abstract: The transient absorption of nanocrystalline TiO2 films in the visible and IR wavelength regions was measured under the weak-excitation condition, where the second-order electron–hole recombination process can be ignored. The intrinsic dynamics of the electron–hole pairs in the femtosecond to picosecond time range was elucidated. Surface-trapped electrons and surface-trapped holes were generated within ∼200 fs (time resolution). Surface-trapped electrons, which gave an absorption peak at around 800 nm, and bulk electrons, which absorbed in the IR wavelength region, decayed with a 500-ps time constant due to relaxation into deep bulk trapping sites. It is already known that, after this relaxation, electrons and holes survive for microseconds. We interpreted these long lifetimes in terms of the prompt spatial charge separation of electrons in the bulk and holes at the surface.
TL;DR: In this paper, the analysis of spectroscopic measurements of a comprehensive set of synthetic Mg-Fe pyroxenes from the visible through the near-infrared (0.3-2.6 μm) to address the constraints of crystal structure and Fe^2+ content on spin-forbidden and spin-allowed crystal field absorptions in Ca-freeorthopyroxenes is presented.
Abstract: Understanding the fundamental crystal chemical controls on visible and near-infrared reflectance spectra of pyroxenes is critical to quantitatively assessing the mineral chemistry of pyroxenes viewed by remote sensing. This study focuses on the analysis ofspectroscopic measurements of a comprehensive set of synthetic Mg-Fe pyroxenes from the visible through the near-infrared (0.3-2.6 μm) to address the constraints of crystal structure and Fe^2+ content on spin-forbidden and spin-allowed crystal field absorptions in Ca-freeorthopyroxenes. The chemistry and oxidation state of the synthetic pyroxenes are characterized. Coordinated Mssbauer spectroscopy is used to determine site occupancy of Fe^2+ in the M1 and M2 crystallographic sites. Properties of visible and near-infrared absorption bands of the synthetic pyroxenes are quantified using the modified Gaussian model. The 1 and 2 μm spin-allowed crystal field absorption bands move regularly with increasing iron content, defining a much tighter trend than observed previously. A spin-allowed crystal field absorption band at 1.2 μm is explicitly verified, even at low total iron contents, indicating that some portion of Fe^2+ resides in the M1 site. The 1.2 μm band intensifies and shifts to longer wavelengths with increasing iron content. At visible wavelengths, spin-forbidden crystal field absorptions are observed in all iron-bearing samples. The most prominent absorption near 506 nm, attributed to iron in the M2 site, shifts to slightly longer wavelengths with iron content. The purity and extent of this pyroxene series allows visible wavelength absorption bands to be directly assigned to specific transitions of Fe^2+ in the M1 and M2 sites.
TL;DR: In this article, cagelike ZnO∕SiO2 nanocomposites were prepared and their microwave absorption properties were investigated in detail, and the measured results indicated that the CAGEL-ZnO nanostructures are low-loss material for microwave absorption in X band.
Abstract: In this paper, cagelike ZnO∕SiO2 nanocomposites were prepared and their microwave absorption properties were investigated in detail. Dielectric constants and losses of the pure cagelike ZnO nanostructures were measured in a frequency range of 8.2–12.4GHz. The measured results indicate that the cagelike ZnO nanostructures are low-loss material for microwave absorption in X band. However, the cagelike ZnO∕SiO2 nanocomposites exhibit a relatively strong attenuation to microwave in X band. Such strong absorption is related to the unique geometrical morphology of the cagelike ZnO nanostructures in the composites. The microcurrent network can be produced in the cagelike ZnO nanostructures, which contributes to the conductive loss.
TL;DR: In this article, the authors used spectral scattering and absorption properties to identify organic carbon at 400C (VolatileOC) and the residual or refractory organic carbon, RefractoryOC.
Abstract: [1] Thermal analysis of aerosol size distributions provided size resolved volatility up to temperatures of 400C during extensive flights over North America (NA) for the INTEX/ICARTT experiment in summer 2004. Biomass burning and pollution plumes identified from trace gas measurements were evaluated for their aerosol physiochemical and optical signatures. Measurements of soluble ionic mass and refractory black carbon (BC) mass, inferred from light absorption, were combined with volatility to identify organic carbon at 400C (VolatileOC) and the residual or refractory organic carbon, RefractoryOC. This approach characterized distinct constituent mass fractions present in biomass burning and pollution plumes every 5–10 min. Biomass burning, pollution and dust aerosol could be stratified by their combined spectral scattering and absorption properties. The ‘‘nonplume’’ regional aerosol exhibited properties dominated by pollution characteristics near the surface and biomass burning aloft. VolatileOC included most water-soluble organic carbon. RefractoryOC dominated enhanced shortwave absorption in plumes from Alaskan and Canadian forest fires. The mass absorption efficiency of this RefractoryOC was about 0.63 m 2 g � 1 at 470 nm and 0.09 m 2 g � 1 at 530 nm. Concurrent measurements of the humidity dependence of scattering, g, revealed the OC component to be only weakly hygroscopic resulting in a general decrease in g with increasing OC mass fractions. Under ambient humidity conditions, the systematic relations between physiochemical properties and g lead to a well-constrained dependency on the absorption per unit dry mass for these plume types that may be used to challenge remotely sensed and modeled optical properties.
TL;DR: It is demonstrated that the MEG efficiency in PbSe does not decrease when the QDs are treated with hydrazine, which has been shown to greatly enhance carrier transport in P bSe QD films by decreasing the interdot distance.
Abstract: We study multiple exciton generation (MEG) in electronically coupled films of PbSe quantum dots (QDs) employing ultrafast time-resolved transient absorption spectroscopy. We demonstrate that the MEG efficiency in PbSe does not decrease when the QDs are treated with hydrazine, which has been shown to greatly enhance carrier transport in PbSe QD films by decreasing the interdot distance. The quantum yield is measured and compared to previously reported values for electronically isolated QDs suspended in organic solvents at ∼4 and 4.5 times the effective band gap. A slightly modified analysis is applied to extract the MEG efficiency and the absorption cross section of each sample at the pump wavelength. We compare the absorption cross sections of our samples to that of bulk PbSe. We find that both the biexciton lifetime and the absorption cross section increase in films relative to isolated QDs in solution.
TL;DR: Modulated drug delivery profiles for methylene blue, insulin, and lysozyme were achieved by irradiation of the drug-loaded nanoshell-composite hydrogels, which showed that drug release was dependent upon the molecular weight of the therapeutic molecule.
TL;DR: A unique property of nanomaterials is demonstrated: energy deposition with nanometer precision from low-energy electrons released from these nanostructures interacting with hard X-ray radiation in aqueous solution.
Abstract: Here we wish to demonstrate a unique property of nanomaterials: energy deposition with nanometer precision from low-energy electrons released from these nanostructures interacting with hard X-ray radiation in aqueous solution. Three effects combine to cause this phenomenon: (1) localized absorption of X-rays by nanostructures, (2) effective release of low-energy electrons from small nanostructures, and (3) efficient deposition of energy in water in the form of radicals and electrons. This combination creates localized X-ray absorption and localized energy deposition of nanometer precision. We confirmed the theoretically predicted nanoscale energy deposition distribution by measuring hydroxyl radical-induced DNA strand breaks, and observed enhanced damage to a 5600-bp DNA molecule from approximately 10 chemically conjugated small gold nanoparticles under X-ray radiation. These results provide a general guidance to applications of this new concept in many fields including radiation chemistry, radiology, radiation oncology, biochemistry, biology, and nanotechnology.
TL;DR: In this article, a homogeneous dispersions of reduced tungsten oxide with ternary additives Na, Tl, Rb, and Cs have been prepared in the wet process and examined for optical properties.
Abstract: Homogeneous dispersions of reduced tungsten oxide and tungsten bronze nanoparticles with ternary additives Na, Tl, Rb, and Cs have been prepared in the wet process and examined for optical properties. The dispersions of reduced tungsten oxide and tungsten bronze nanoparticles are found to show a remarkable absorption of near infrared light while retaining a high transmittance of visible light. This property is highly suitable for solar control filters in automotive and architectural windows.
TL;DR: This study establishes that, in comparison to porphyrins and other tetrapyrrolic macrocyclic systems, porphycenes exhibit many desirable attributes for use as sensitizers in two-photon initiated photodynamic therapy.
Abstract: Porphycenes are structural isomers of porphyrins that have many unique properties and features. In the present work, the resonant two-photon absorption of 2,7,12,17-tetraphenylporphycene (TPPo) and its palladium(II) complex (PdTPPo) has been investigated. The data obtained are compared to those from the isomeric compound, meso-tetraphenylporphyrin (TPP). Detection of phosphorescence from singlet molecular oxygen, O2(a1Δg), produced upon irradiation of these compounds, was used to obtain two-photon excitation spectra and to quantify two-photon absorption cross sections, δ. In the spectral region of 750−850 nm, the two-photon absorption cross sections at the band maxima for both TPPo and PdTPPo, δ = 2280 and 1750 GM, respectively, are significantly larger than that for TPP. This difference is attributed to the phenomenon of so-called resonance enhancement; for the porphycenes, the two-photon transition is nearly resonant with a comparatively intense one-photon Q-band transition. The results of quantum mecha...
TL;DR: In this article, the wavelength dependencies of the two-and three-photon absorption coefficients of undoped GaAs in the spectral range 1.3-3.5 microm were reported.
Abstract: We report the wavelength dependencies of the two- and three-photon absorption coefficients of undoped GaAs in the spectral range 1.3-3.5 microm, as well as nonlinear refractive index n2 in the range 1.7-3.25 microm. The data were obtained by using the single-beam Z-scan method with 100-fs-long optical pulses. Anisotropy of the three-photon absorption coefficient was observed and found to be consistent with the crystal symmetry of GaAs.
Book•
01 Jan 2007
TL;DR: In this article, the authors present an analysis of the conditions governing UV-VIS Absorption by the Principal Organic Absorbers in the Sea and the effect of Auxochromic Groups and Complexes on the Optical Properties of Organic Compounds in the Ocean.
Abstract: Chapter 1. Introduction Chapter 2. Light Absorption by Water Molecules and Inorganic Substances Dissolved in Sea Water 2.1 The Absorption of Light by Water Molecules 2.2 The Absorption of Light by Atoms, Sea-salt Ions, and Other Inorganic substances dissolved in sea water Chapter 3. The Impact of Light on Organic Molecules: Physical Principles 3.1 The Characteristic Absorption Properties of Simple Chromophores in Organic Molecules (=> in Preparation) 3.2 The Absorption Properties of Complex Organic Molecules with Conjugated p-electrons 3.3 The Influence of Auxochromic Groups and Complexes on the Optical Properties of Organic Compounds in the Sea Chapter 4. The Absorption of Light by Dissolved Organic Matter (DOM) in Sea Water 4.1 The Classification, Origin, and General Characteristics of Light Absorption by the Principal Groups of Organic Absorbers in Sea Water 4.2 Analysis of the Conditions Governing UV-VIS Absorption by the Principal Organic Absorbers in the Sea Chapter 5. The Absorption of Light by Marine Suspended Particles - a General Description 5.1 Quantum-mechanical-electrodynamic Description of Light Absorption in Polydispersive Media Elements of Mie Theory 5.2 => in preparation Chapter 6. Absorption of Light by Phytoplankton in the Sea 6.1 Abiotic Factors Governing the Absorption of Light by Phytoplankton in the Sea 6.2 Phytoplankton Pigments and Their Electronic Absorption Spectra in the Visible Region 6.3 Resources of Phytoplankton and Concentrations of Chlorophyll a in Oceans and Seas 6.4 The Composition of Chlorophyll a and Necessary Pigments in Marine Algae 6.5 The Pigment Packing Effect in Phytoplankton Cells in the Ocean 6.6 The Overall Absorption of Light by Marine Algae: the Results of Empirical Studies 6.7 Model Description of the Absorption Properties of MarinePhytoplankton - a Review Chapter 7. Absorption of Light by Non-algal Particles Chapter 8. References
TL;DR: In this article, the authors used terahertz (THz) time-domain transmission spectroscopy to obtain the absorption coefficients and refractive indices of silica, Pyrex, and seven different Schott glasses.
Abstract: Terahertz (THz) time-domain transmission spectroscopy was used to obtain the absorption coefficients and refractive indices of silica, Pyrex, and seven different Schott glasses. The refractive indices were analyzed using the Clausius–Mossotti equation, and the absorption coefficients in terms of the power-law model of far-infrared absorption. Relationships were observed between THz absorption and refractive indices on the one hand, and glass properties on the other. THz transmission data have been shown to provide a useful insight into glass structure.