Showing papers on "Stokes shift published in 1984"
TL;DR: In this article, a theory for the time evolution of the Stokes shift of a polar molecule in a polar solvent is presented, where the time-dependent solute-solvent interaction is calculated in a continuum model by replacing the surrounding solvent by a frequency-dependent dielectric continuum.
351 citations
TL;DR: In this article, the luminescence properties of the bismuth compounds Bi2Ge3O9, Bi12MO20, Bi2Al4O9 and PbM2O4 (M = Al, Ga) are reported and discussed.
147 citations
TL;DR: In this article, the authors present the first Stokes and anti-Stokes Raman intensity measurements of a molecular system using laser excitation throughout a resonant electronic transition and derive a general expression for the Boltzmann factor in terms of the resonant Stokes/anti−Stokes scattering intensities.
Abstract: We present the first Stokes and anti‐Stokes Raman intensity measurements of a molecular system using laser excitation throughout a resonant electronic transition. Experiments on oxidized and reduced cytochrome c at both room and cryogenic temperatures are reported. We employ a Kramers–Kronig transform method in our analysis and use the absorption and Raman cross sections on an absolute scale in order to find the linear Franck–Condon coupling strengths of the observed low frequency modes. A general expression for the Boltzmann factor is also derived in terms of the resonant Stokes and anti‐Stokes scattering intensities. This expression is appropriate for the determination of temperatures in absorbing media. The traditional Stokes/anti‐Stokes ratio used for this purpose is shown to fail both experimentally and theoretically when the laser excitation is in resonance with an electronic transition of the material under study. Finally, we discuss the frequency domain approximations necessary for application of ...
76 citations
TL;DR: In this paper, the luminescence spectra of calcium halophosphate co-doped with Sb3+ and Mn2+ at liguid-helium temperature are reported.
37 citations
TL;DR: In this article, the first observation of a totally non-degenerate phase-matched four-photon mixing (FPM) in a fiber was reported, which invokes mixing of the original FPM Stokes component with the pump and stimulated Raman radiation.
30 citations
TL;DR: The luminescence properties of Bi3+ and Pb2+ in CsCdBr3, and of undoped CscdBr 3 are reported in this article, where the Stokes shift amounts 2.1 eV and the quenching temperature is low.
25 citations
TL;DR: The luminescence of Bi3+ in the host lattices LnBO3 depends strongly on the nature of the Ln3+ ion as mentioned in this paper, and the Stokes shift increases from 0.22 eV to 1.16 eV for LaBO3-Bi.
25 citations
TL;DR: In this paper, the luminescences of Bi 3+ and Mn 2+ in LaMgB 5 O 10 were reported, where the emission of the Bi 3 + ion shows a small Stokes shift and is situated in the ultraviolet.
24 citations
TL;DR: In this paper, a new dye emitting in the red which may be useful for several applications owing to its interesting spectral properties: a board first absorption band, large Stokes shift, and good quantum yield with a very small temperature and excitation-wavelenghth dependence.
19 citations
TL;DR: In this article, the luminescence of mercury-like ions (Sn2+, Sb3+, Tl+, Pb2+, Bi3+) in this host lattice is characterized by a large Stokes shift.
19 citations
TL;DR: In this article, the properties of localized deep-level MOE2 in InP have been investigated and the electron capture cross-section has a strong temperature dependence in the temperature range from 222 K to 276 K.
Abstract: The properties of the localized deep-level MOE2 in InP have been investigated. The electron capture cross-section has a strong temperature dependence in the temperature range from 222 K to 276 K. A thermal depth of Et=0.15 eV and an optical depth of Eopt=0.48 eV have been obtained for MOE2 by normal and optical deep-level transient spectroscopy (DLTS). These results indicate that a Stokes shift, which is characteristic of strong electron-phonon coupling, occurs at the MOE2 level. The experimental results on the temperature-dependent capture cross-section can be explained fairly well by the recently-formulated multiphonon emission electron capture mechanism.
TL;DR: In this article, the Stokes wave can be captured in the region of inversion and conditions are found for complete energy transfer from the pump 2π-pulse to the stokes wave.
TL;DR: In this paper, the magnitude of the Stokes shift and position of the luminescent Franck-Condon transition were calculated taking into account the change in molecular geometry upon excitation.
TL;DR: The spectral and photochemical properties of 1-naphthyl-2,4-di- and 2,4,6-triphenylpyridinium perchlorates were investigated in solutions at 293 and 77 °K as mentioned in this paper.
Abstract: The spectral-fluorescent and photochemical properties of 1-naphthyl-2,4-di- and 2,4,6-triphenylpyridinium perchlorates were investigated in solutions at 293 and 77 °K. The anomalously large Stokes shift of the fluorescence was due to the adiabatic change in the structure of the molecules as a result of rotations of the C- or N-aryl substituents. The observed phosphorescence arises as a result of intramolecular T-T transfer of energy to the N-naphthyl radical. 1-Naphthyl-2,4-diphenylpyridinium cations are capable of photocyclization with the formation of intensely fluorescent derivatives of benzo[b or c]pyrldo[1,2-f]phenanthridinium, isolated with high yields in preparative photolysis.
TL;DR: In this article, a mechanism of photoluminescence in hydrogenated amorphous silicon-carbon alloy is discussed on the basis of the Stokes shift, decay time and polarization memory of luminescence.
TL;DR: In this paper, low temperature fluorescence and fluorescence excitation spectra of a single crystal biphenyl host were analyzed in terms of seven vibrational modes including three phenyl modes, three normal modes involving N−N and C−N stretching and bending motion, and a low frequency torsional vibration about the central C-N bond.
Abstract: Low temperature fluorescence and fluorescence excitation spectra of 2‐(2′‐hydroxy‐5′‐methylphenyl)‐benzotriazole (MeHPB) in a single crystal biphenyl host are reported which exhibit sharp vibrational structure. The spectra are analyzed in terms of seven vibrational modes including three phenyl modes, three normal modes involving N–N and C–N stretching and bending motion, and a low frequency torsional vibration about the central C–N bond. The fluorescence exhibits a normal Stokes shift indicating that excited‐state intramolecular proton transfer is precluded in this mixed crystal probably because the MeHPB molecule is held in a nonplanar conformation by molecular packing forces. A model of the MeHPB molecule based on semiempirical molecular orbital calculations is also presented which provides support for these conclusions.
TL;DR: In this article, the authors compared the emission of representative lamp phosphors with the Gauss error function, and observed that the deviation from the Gaussian curve was observed in the high energy side of the emission peak for s2 ion activators, and in the low energy side for Mn2+ and Eu2+.