Abstract
We measured the polarized binary collision-induced light scattering spectrum from room-temperature gaseous helium over the greatly extended spectral domain $\ensuremath{\nu}=5\char21{}1200{\mathrm{cm}}^{\mathrm{\ensuremath{-}}1},$ and then deduced the isotropic spectrum that we report in the interval $\ensuremath{\nu}=100\char21{}1200{\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}.$ Our experimental results were calibrated on an absolute scale. These data were compared to those from quantum-mechanical computations, where use of advanced induced-polarizability incremental traces was made. This comparison enabled us to check several trace models and to show that for certain ab initio ones the computed spectra agree well with our measurements. As was borne out from our computations the main contributions to the spectral intensities come from the exchange component of the incremental trace and its negative mixing with the rest of the trace components.
Published Version
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