Raman Scattering by Optical Phonons In TaSe3 and NbSe3

摘要: Abstract Room-temperature Raman spectra have been obtained between 20 cm−1 and 400 on the low-dimensional metals TaSe3, NbSe3. The Ag exhibit numerous closely spaced lines corresponding to vibrational modes with displacement vectors perpendicular chain axis. To interpret these we made direct use of bond-strength results our lattice dynamical model for ZrSe3, which has a similar prismatic structure. broad correlations data calculated frequencies indicate that C2V symmetry is preserved in Bg vibrations; strong metal-selenium bonds exist link chains into layers; Se-Se pairing within weaker more varied TaSe3 NbSe3 than ZrSe3.