Determination of the gas-surface scattering kernel from two-photon evanescent-volume-wave fluorescence spectra

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Abstract
The gas-surface scattering kernel for Na atoms interacting with a dielectric surface is obtained by measuring and theoretically reproducing two-photon evanescent-volume-wave spectra. From a detailed analysis of the spectral line shapes the contribution of inelastically scattered atoms is identified and a mean energy transfer of 36 meV is deduced for atoms having initial mean thermal energies of 79 meV. The mean probability of direct scattering mediated by surface phonons increases from 0.03 to 0.05 by increasing the surface temperature from 386 K to 398 K.