Two-photon evanescent-wave spectroscopy of alkali-metal atoms
- 1 August 1999
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 60 (2) , 1538-1548
- https://doi.org/10.1103/physreva.60.1538
Abstract
The two-photon spectrum of sodium atoms, excited by two counterpropagating evanescent waves, is investigated both experimentally and theoretically. Sub-Doppler linewidths are observed, which are quantitatively reproduced by a rigorous theoretical approach that takes into account optical pumping and transit time broadening due to the translational motion of the arriving and departing atoms through the evanescent-wave fields. The velocity distribution of the atoms desorbing from the surface is found to obey a cosine law, which has a significant influence on the observed line shapes.Keywords
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