The 2ν3 Raman overtone of sulfur hexafluoride: Absolute spectra, pressure effects, and polarizability properties

摘要: Of the six normal vibrations of SF6, ν3 has a key role in mechanisms radiative forcing. This vibration, though inactive Raman, shows up through transition 2ν3 allowing for complementary view on asymmetric stretch molecule. Here, we look back into this topic, which already caught some interest past but with points been left out. We make systematic incoherent-light-scattering analysis overtone use different gas pressures and polarization orientations incident beam. Absolute-scale isotropic anisotropic spectra are reported along natural pressure-induced widths shifts, other spectral features such as peaks corresponding to (experimentally indistinguishable) interfering channels Eg F2g hitherto seen solely two-photon IR-absorption features. first-ever prediction SF6 polarizability second derivative respect ν3-mode coordinate develop heuristic argument explain why superposition three degenerate stretching motions that related mode cannot generate polarized Raman band.