Showing papers on "Infrared spectroscopy correlation table published in 1980"
55 citations
TL;DR: In this article, a wide selection of infrared absorption spectra of opaque samples is presented to show the versatility of Fourier-transformed infrared photoacoustic spectroscopy, and a method for correcting these spectra for incident radiant power variations with respect to wavelength is also demonstrated.
Abstract: A wide selection of infrared absorption spectra of opaque samples is presented to show the versatility of Fourier-transformed infrared photoacoustic spectroscopy. A method for correcting these spectra for incident radiant power variations with respect to wavelength is also demonstrated.
52 citations
01 Jan 1980
TL;DR: The application of the developed method to the rhodopsin/Meta II transition reveals signals which can tentatively be ascribed to the disappearance of the C=C-band of the protonated N-retinylidene Schiff base in rhodopin.
Abstract: A flash photolysis apparatus with monitoring infrared beam is described allowing measurements of relative transmission changes of 10−3 in times of a few milliseconds. The investigation of the photodissociation of CO-myoglobin confirms the results obtained by static infrared difference spectroscopy. The application of our method to the rhodopsin/Meta II transition reveals signals which can tentatively be ascribed to the disappearance of the C=C-band of the protonated N-retinylidene Schiff base in rhodopsin. The developed method will be compared with other existing methods of kinetic vibronic spectroscopy such as kinetic resonance Raman spectroscopy and kinetic Fourier infrared spectroscopy.
47 citations
TL;DR: Isotopic effects observed in the infrared spectra of CO adsorbed on the Cu(111) surface are shown to be compatible with a dipole-coupling model which relates frequency shifts to the accompanying changes in infrared band intensity.
39 citations
TL;DR: In this paper, Raman and infrared spectra on well-staged graphite-Al${\mathrm{Cl}}_{3}$ are reported for compounds with stages $n=1, 2, 4, and 8.
Abstract: Raman and infrared spectra on well-staged graphite-Al${\mathrm{Cl}}_{3}$ are reported for compounds with stages $n=1, 2, 4, \mathrm{and} 8$. Of significance is the absence of infrared-active modes for stage-1 graphite-Al${\mathrm{Cl}}_{3}$ and the presence in stages 2, 4, and 8 of three infrared-active modes in the vicinity of the graphite ${E}_{1u}$ mode. The Raman-active modes in graphite-Al${\mathrm{Cl}}_{3}$ behave similarly to the corresponding bounding-layer and interiorlayer graphitic modes in graphite-Fe${\mathrm{Cl}}_{3}$ with regard to the stage dependence of the peak frequencies and relative intensities.
37 citations
TL;DR: In this article, a good fit of the 10 μm absorption feature could be achieved, but some discrepancies remain in the 20 μm region, and the reasons for the weakness of the 20 µm band in infrared sources are discussed.
Abstract: Infrared spectra of submicrometre-sized particles of several protosilicates have been used to derive mass absorption coefficients. These data have been applied in order to describe the infrared radiation from the source OH 26.5+0.6 in terms of a simple model. A good fit of the 10 μm absorption feature could be achieved, but some discrepancies remain in the 20 μm region. The reasons for the weakness of the 20 μm band in infrared sources are discussed.
22 citations
TL;DR: In this paper, a systematic study of the infrared and Raman spectra of 20 simple and complex solid thiosulfates with known structure involving various metal-S 2 O 3 associations has lead to a consistant set of spectra-structure correlations.
19 citations
TL;DR: In this paper, Fourier transform infrared, transmission spectroscopy is presented as a technique with great potential for the study of aqueous membrane preparations and the methodology of spectra acquisition and data reduction is outlined.
17 citations
TL;DR: The applicability of transmission or attenuated total reflectance (ATR) techniques is often limited by the scattering of the radiation as discussed by the authors, which can be spectrally analyzed, if the diffuse reflected radiation can be collected and transfered to the infrared detector.
Abstract: Investigations of solids, especially of powders, are of great interest in infrared spectroscopy. The applicability of transmission or attenuated total reflectance (ATR) techniques is often limited by the scattering of the radiation. This scattering can be spectrally analyzed, if the diffuse reflected radiation can be collected and transfered to the infrared detector.
TL;DR: In this paper, the design and construction of an infrared spectrophotometer for the quantitative measurement of attenuated total reflection spectra are described, which is used to determine the optical constants of liquids as part of a study of infrared band shapes and intensities.
Abstract: The design and construction of an infrared spectrophotometer for the quantitative measurement of attenuated total reflection spectra are described. The instrument is used to determine the optical constants of liquids as part of a study of infrared band shapes and intensities.
TL;DR: In this article, the refined values for molecular constants of 14NH3 and less precise values for those of 15 NH3 and 14NH2D were obtained with laser Stark spectroscopy.
Abstract: Refined values for molecular constants of14NH3 and less precise values for those of15NH3 and14NH2D were obtained with laser Stark spectroscopy.
TL;DR: A Pfund-type absorption cell that exhibits extreme stability at high temperature has been constructed for use with high-resolution Fourier spectroscopy.
Abstract: A Pfund-type absorption cell that exhibits extreme stability at high temperature has been constructed for use with high-resolution Fourier spectroscopy. The cell is currently used to measure the absorption spectra of CO(2) and H(2)O gas samples heated to 1300 K. The advantages of the Pfund cell are described with respect to that of the White cell for use in Fourier spectroscopy.
TL;DR: In far-infrared Fourier spectroscopy with a Michelson interferometer deviations in the measured transmission spectra of samples with non-negligible reflection can be observed.
TL;DR: In this article, the infrared reflectivity spectra of GaS1−xSex mixed crystals are measured for E c in the wavenumber range from 180 to 4000 cm−1 two-mode behaviour is found for the infrared active optical modes.
26 Nov 1980
26 Nov 1980
TL;DR: FT-IR, when combined with proper sample handling, elemental analysis, the use of appropriate reference standards, and a simple separation step, has proven superior to other techniques in the identification of many inorganic compounds.
Abstract: Work at Battelle Columbus Laboratories has resulted in the development of a methodology that permits the identification of individual inorganic species, even in complex particulate pollutant mixtures. Development of this capability has permitted the identification of various sulfates and oxides obtained from both coaland oil-fired fly ash samples. The analysis technique is based on the sensitivity, stability, and computerized data handling capabilities inherent to Fourier transform infrared systems (FT-IR). In our experience, FT-IR, when combined with proper sample handling, elemental analysis, the use of appropriate reference standards, and a simple separation step, has proven superior to other techniques in the identification of many inorganic compounds. In many cases, the infrared results were verified by also obtaining independent X-ray diffraction (XRD) data on the same sample.
TL;DR: In this article, the advantages of Fourier transform infrared reflectivity spectroscopy with a scanning interferometer equipped to work up to 1400 K in the studies of ferroelectric materials are discussed.
Abstract: The advantages of Fourier-transform infrared reflectivity spectroscopy with a scanning interferometer equipped to work up to 1400 K in the studies of ferroelectric materials are discussed. Results obtained in BaTiO3 are compared with Raman data. Anharmonic effects such as anomalous dependence of damping on temperature are briefly analysed.
TL;DR: In this paper, an original and simple pressure sealing system is described, which allows investigations of molecules in the gas phase over a wide infrared range for pressures from a few torr to 300 bar.
DOI•
01 Oct 1980TL;DR: In this article, the analysis of band shapes of the 1400 cm−1 bending mode of NH4Cl, NH4Br and NH4I in both the Pm3m and Fm 3m phases is presented.
Abstract: Infrared correlation functions, have been obtained from the analysis of band shapes of the 1400 cm−1 bending mode of NH4Cl, NH4Br and NH4I in both the Pm3m and Fm3m phases. The NH 4 + ion seems to undergo relatively free rotation in the high temperature Fm3m phases of these halides.
TL;DR: In this article, molecular level changes occurring due to external stress application have been studied by the dynamic infrared spectroscopic technique using Fourier Transform Infrared Spectrometer (FTIS).
Abstract: Molecular level changes occurring due to external stress application have been studied by the dynamic infrared spectroscopic technique using Fourier Transform Infrared Spectrometer. The “subtraction” spectrum (stressed — 88% unstressed) of polystyrene has shown even minute changes in 540, 903, 1154, 1310, 1376, and 1602 cm1 infrared bands assigned to various vibrational modes of phenyl side groups. Both infrared and x-ray results have indicated certain conformational rearrangements (under stress) of these bulky phenyl side groups present in the PS chains.
TL;DR: The far infrared absorption spectra of cyclohexanol-OD have been measured in the 20 - 500 cm−1 frequency range for crystal III, II, I and liquid phases as mentioned in this paper.
Abstract: The far infrared absorption spectra of cyclohexanol-OD have been measured in the 20 - 500 cm−1 frequency range for crystal III, II, I and liquid phases. Comparison with cyclohexanol-OH and the isotope effect is discussed.