In this paper, the Raman spectrum of the crystal α-AlPO_4 at various conditions of geometry orientation have been measured and analysed. All Raman active modes of it have been identifized, including the A type mode at 437cm~(-1) for the first time and the modes in dispute at 1040, 745,1098, and 1130cm~(-1).
This article presents the experimental investigation of SERS spectra of four kinds of Raman active molecule adsorbed at a roughened silver electrode surface. The SERS spectra of these molecules are given.
The experiment shows that the surface roughness has great influence on the enhancement of the Raman scattering spectra of the adsorbed Raman active molecules. The potential applied on the silver electrode has also influence onthe enhancement of SERS spectra.
The paper presents the group theoretical calculation of the number and forms of the Raman active normal modes of polyphenylene sulphide using the projection operator technique and considering the characteristic vibrational unit of the polymer. The calculated results were compared with the experimental results and were discussed.
The vibrational infrared spectra and Raman spectra of three perfluoroalkyl iodides(CF_3I、C_2F_5I and n-C_3F_7I) were calculated by using ab initio molecular orbital theory at the HF、MP2 and B3LYP levels. To every frequency,the symmetries of vibrational modes,relative intensities of infrared spectra and Raman activities were given.
Both the infrared intensities as well as the Raman activities and depolarization values have been obtained from the ab initio calculations.
The optimized geometries, conformational stabilities, harmonic force fields, infrared intensities, Raman activities, depolarization ratios, and vibrational frequencies have been obtained from RHF/6-31G* and/or MP2/6-31G* ab initio calculations.
The optimized geometries, conformational stabilities, harmonic force fields, infrared intensities, Raman activities, depolarization ratios, and vibrational wavenumbers have been obtained from RHF/6-31G* and/or MP2/6-31G* ab initio calculations.
Both the infrared intensities and the Raman activities and depolarization values have been obtained from the ab initio calculations.
Infrared intensities and Raman activities were calculated from the unscaled HF/6-31G//HF/6-31G force fields.
The baric shift dω/dP and the Grüneisen parameters of the Raman-active intramolecular phonon modes have been determined.
Ultrafast transient processes are shown to qualitatively modify the nonlinear-optical response of a Raman-active medium.
Even at a low acceptor concentration (one TNF molecule per 10 monomer units of the polymer), most Raman-active conjugated chains are involved in the CTC.
Optical nutation at the Raman-active transition 6P1/2-6P3/2 of thallium atoms (ωR/2πc=7793 cm -1) under resonant Raman excitation by a biharmonic picosecond pulsed field, giving rise to substantial motion of the population, is detected.
On the bistable behavior of a low-frequency Raman-active phonon line in superconducting oxide Ba1-xKxBiO3