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Zeitschrift für Physik D Atoms Molecules and Clusters

Polarization and velocity dependence of associative ionization in Na(3p)+Na(3p) collisions

Harro A. J. Meijer, H. P. van der Meulen, Reinhard Morgenstern

Published Dec 1, 1987• 23 citations
Publisher
DOI
10.1007/bf01385460

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We have investigated the associative ionization of Na atoms in two counterpropagating thermal beams independently excited by various combinations of linearly and circularly polarized light. In this way information about coherence contributions to the ion signal has been obtained for the first time. These contributions which correspond to off-diagonal elements of the detection matrix have hitherto been neglected, but are of the same magnitude as the cross sections themselves and depend on the velocity.
We report new results on the direct measurement of the associative ionization (AI) cross section in collisions between velocity-selected and spin-oriented Na(3p) atoms. Improvements in the Doppler-shift velocity-selection technique permit measurement over an energy range spanning more than two orders of magnitude from subthermal to suprathermal regions. Spin orientations, parallel and antiparallel, enable determination of the excitation function (velocity dependence of the AI cross section) for the separate singlet and triplet manifolds of Na2{\mathrm{Na}}_{2}Na2​ states contributing to the AI process.