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Springer series in optical sciences/SPringer series in optical sciences

Heating of Atoms by Collisionally Assisted Radiative Excitation

E. Giacobino, M. Tawil, Olav Redi, Raymond J. Vetter, H. Henry Stroke, P. R. Berman

Published Jan 1, 1983• 0 citations
Publisher
DOI
10.1007/978-3-540-38814-2_55

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The transfer of energy from the translational to the internal degrees of freedom or vice versa is analyzed for radiatively assisted inelastic collisions among atoms in a gas. For a specific atomic-level configuration, it is shown that the absorption of a laser photon may induce a transition between two levels that are displaced by the collisional interaction (a dipole-dipole potential in this treatment) if a fraction of the kinetic energy of the atomic relative motion is simultaneously absorbed. The process thus results in a cooling of the atomic kinetic temperature. In other level configurations, energy goes in the opposite direction, with a heating of the kinetic temperature. This mechanism is described by means of the Wigner-function formalism, which allows a passing to the quasiclassical limit for the atomic motion in a simple way.