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Ionization of hydrogen and deuterium atoms in thermal energy collisions with state-selected Ne(3s 3 P 2,3 P 0) metastable atoms

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Zeitschrift für Physik A Atoms and Nuclei

Abstract

High resolution energy spectra of electrons and ions resulting from thermal energy collisions of hydrogen and deuterium atoms with state-selected metastable Ne(Ne(3s 3 P 2,3 P 0) atoms are reported. The electron spectra for Ne(3 P 2)+H(D) are very broad: The high energy part due to formation of NeH+ (NeD+) bound states (associative ionization), amounts to about 30% of the ionizing events, whereas the dominant part of the spectrum including a prominent low-energy peak is due to Penning ionization out of a strongly-attractive entrance potential curve. Comparison of the spectra with quantum mechanical fit calculations yields fairly accurate information on this potential, in particular its well depthD e [Ne(3 P 2)−H,D]= 2.0(1) eV. The spectra for Ne(3 P 0)+H, D are comparatively narrow with much lower cross sections than the one for the Ne(3 P 2) state. The corresponding entrance channel is a weakly bound van der Waals molecule with a well depth below 0.1 eV. A perturbation calculation of the Ne(3s)+H(1s) potential energy curves at large distances explains the observed difference between the Ne(3 P 2)+H(D) and Ne(3 P 0)+H(D) systems. Symmetry arguments are given that the major contribution to the Ne(3 P 2)+H(D) spectra is due to the2 Σ potential.

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Authors and Affiliations

  1. Institut für Experimentalphysik der Universität, Kiel, Federal Republic of Germany

    J. Lorenzen

  2. Fakultät für Physik der Universität, Freiburg, Federal Republic of Germany

    H. Morgner

  3. Fachbereich Physik der Universität, Kaiserslautern, Federal Republic of Germany

    W. Bußert, M. -W. Ruf & H. Hotop

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  1. J. Lorenzen
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  2. H. Morgner
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  3. W. Bußert
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  4. M. -W. Ruf
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  5. H. Hotop
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Additional information

We acknowledge support of this work by the Deutsche Forschungsgemeinschaft. The computations have been carried out on the UNIVAC 1100/80 of the Rechenzentrum der Universität Freiburg.

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Lorenzen, J., Morgner, H., Bußert, W. et al. Ionization of hydrogen and deuterium atoms in thermal energy collisions with state-selected Ne(3s 3 P 2,3 P 0) metastable atoms. Z Physik A 310, 141–152 (1983). https://doi.org/10.1007/BF01415220

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  • DOI: https://doi.org/10.1007/BF01415220

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