Hyper-Raman scattering and the selection rules for the wave vector
... component xxxXx
differs from zero, i.e., the excited vibrations are polarized along the x axis (E, Ilx) Since the wave
vector k, of the excited vibration lies in theyz plane (Fig. la),
in this case E, lk,, and consequently, only TO modes can
appear in the HRS spectra.
B. E, 1l.z and Ei Ilx. The zero ...