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Advances in atomic and molecular physics

Collision Experiments with Laser Excited Atoms in Crossed Beams

Ingolf Volker Hertel, W. Stoll

Published Jan 1, 1978• 268 citations
Publisher
DOI
10.1016/s0065-2199(08)60056-1

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Different possible uses of lasers in crossed beam experiments are examined. The scope is limited to low energy collisions (few tens of meV) between excited atoms and atoms or molecules. The first role of the laser in this kind of experiments is that of a selector, allowing either the preparation of the incoming channel or the analysis of the outcoming one, by selecting one definite atomic level (radiative or metastable), one class of velocities, one magnetic sublevel. In all these applications, the laser does not act on the collision process itself. The situation is quite different at high laser powers and frequencies detuned with respect to atomic frequencies. Some suggestions are made about the feasability of crossed beam studies of these laser-assisted collisions.
Electron scattering by excited sodium atoms has been carried out in a crossed-beam experiment. The atoms have been optically pumped into a well defined hyperfine level (3 2 P 3 2/F=3) by a tunable CW dye laser. For two of the most prominent scattering processes, the 3 2 P to 3 2 S and 3 2 P to 4 2 S transitions, the effect of the anisotropy of the initial state introduced by the laser light is studied in detail and is interpreted in terms of multipole moments describing the optical excitation and the collision process. Possibilities and limitations of the experiment are discussed. Electron collisions may be seen as a test case for the understanding of more involved interaction processes.
Optical collisions in a crossed beam experiment are examined for the atomic collision pairs LiHe, LiNe, NaNe.Differential cross sections are measured in order to probe the quallity of quantum chemical calculated and spectroscopical determined molecular potentials.The linear polarization of the excitation laser is used to manipulate the contrast of the differential cross sections for NaNe.Using elliptical polarized light total control over the angular position and the contrast of the interference pattern is demonstrated.Differential cross sections for the collision pairs LiH and LiD show a pronounced oscillatory structure, which for the first time is observed for atom-molecule optical collisions.