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Polarized Raman spectra IX. Low Frequency Vibrations in Crystallne Trans‐Stilbene
Author(s) -
Ting ChenHanson
Publication year - 1972
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.197200011
Subject(s) - chemistry , raman spectroscopy , raman scattering , excited state , vibration , bending , molecular physics , molecular vibration , intensity (physics) , analytical chemistry (journal) , atomic physics , optics , materials science , physics , quantum mechanics , chromatography , composite material
Raman spectrum of powdered crystalline trans‐stilbene is recorded by a laser Raman spectrometer. The intensity of a low frequency skeleton bending vibration at 220 cm −1 is observed to be very weak. Its Raman intensity, after corrected for the photocathode response and for the v 4 scattering factor, agrees within 10% of the theoretically calculated value. It is therefore proved that the intensity of a Raman active vibration is proportional to the square of its vibrational frequency, if only one excited state is involved in the scattering process. Lattice vibrations in trans‐stilbene crystal are also reported.