Sub-Doppler Absorption Resonances Caused by Pumping of Atoms with Evanes cent Radiation in Thin Gas Cells

New nontrivial sub-Doppler absorption resonances caused directly by steady-state optical pumping of atoms by evanescent radiation in thin cells with a rarefied gas medium were theoretically established and studied. The dependences of these resonances on the intensity of such evanescent pumping and its penetration depth into the gas were analyzed. The possibility of detecting these resonances using previously developed, well-tested laser spectroscopy methods in such thin gas cells was substantiated. The established sub-Doppler resonances can provide important information about the mechanism of atom-surface interaction, as well as the properties of evanescent waves.

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