Frequency shifts from gas to crystal—I: SiH4 and SiD4

摘要: Abstract The existing theory of vibration frequency shifts in crystals is reviewed briefly. It suggested that the total gas-crystal shift Δν t may usefully be divided into two separate parts, m matrix and c coupling shift. latter measures part due to between vibrations translationally equivalent molecules independent correlation field splitting. Some considerable SiH 4 , SiD their mutual solid solutions have been measured. In these magnitudes are similar. contributions from dipole-induced dipole dipole-dipole forces calculated using Kirkwood-Bauer-Magat Haas Ketelaar equations. These predict range 30–60 per cent observed ones. this proportion would greatly increased a more realistic treatment classical electrostatic forces.