Polarized Raman spectra IX. Low Frequency Vibrations in Crystallne Trans‐Stilbene

摘要

AbstractRaman spectrum of powdered crystalline trans‐stilbene is recorded by a laser Raman spectrometer. The intensity of a low frequency skeleton bending vibration at 220cm−1is observed to be very weak. Its Raman intensity, after corrected for the photocathode response and for thev4scattering 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 stateisinvolved in the scattering process.Lattice vibrations in trans‐stilbene crystal are also rep