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Interaction potentials and energy transfer cross sections for collisions of metastable helium and neon I: He(23 S)+Ne

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Zeitschrift für Physik A Atoms and Nuclei

Abstract

Differential cross sections have been measured for He(23 S)+Ne at kinetic energies between 28 and 370 meV. For energies above 90meV the elastic cross sections show Stückelberg oscillations from curve crossings, which lead to the energy exchange process: He(23 S)+Ne→He(11 S)+Ne(2p 5 4s,3d,4p). Differential cross sections for this inelastic process could be measured above 200 meV. A fit to the data gives the potentials for He(23 S)+Ne and, less accurately, for He+Ne*. These results offer a simple explanation, why the exothermic pumping process of the infrared lines of the HeNe laser has a threshold of about 80 meV and a small cross section.

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Authors and Affiliations

  1. Fakultät für Physik der Universität, Freiburg, Germany

    Hellmut Haberland & Peter Oesterlin

Authors
  1. Hellmut Haberland
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  2. Peter Oesterlin
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Additional information

This work was financially supported by the Deutsche Forschungsgemeinschaft. We would like to thank Dr. I. Dabrowski (Ottawa) for sending us the RKR potentials for HeNe+ and Prof. U. Fano (Chicago) for a very illuminating discussion on spin-orbit effects in molecules. Mr. D. Cooper (Oxford) calculated theR-dependence of the spin-orbit matrix element within two days, after learning of this problem.

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Haberland, H., Oesterlin, P. Interaction potentials and energy transfer cross sections for collisions of metastable helium and neon I: He(23 S)+Ne. Z Physik A 304, 11–21 (1982). https://doi.org/10.1007/BF01432271

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  • DOI: https://doi.org/10.1007/BF01432271

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