Ionization during collisions of resonantly-excited Ne(3s{sup 1,3}P{sub 1}) atoms with H{sub 2} and D{sub 2} molecules
- State Univ., St. Petersburg (Russian Federation)
The terms of the quasimolecule Ne(2p{sup 5}3S)-H{sub 2} are calculated by the pseudopotential method. It is shown that the potential surfaces for all the states of Ne(2p{sup 5}3S)-H{sub 2} are almost identical (in the region accessible to thermal collisions) and depend weakly on the orientation of the H{sub 2} molecule. The autoionization widths of resonantly exacted quasimolecular states Ne(3s{sup 1,3}P{sub 1}) with H{sub 2} and D{sub 2} molecules are presented in the form of a sum of calculated contributions of the direct ionization mechanism and of the exchange mechanism, which are expressed in terms of experimental cross sections and constants for metastable Ne(3s{sup 3}P{sub 0,2}) atoms. The ionization rate constants obtained at T = 300 K agree with existing experimental data. It is shown that for the collisions Ne(3s{sup 1}P{sub 1}) + H{sub 2}, D{sub 2} the ionization process is governed by the direct mechanism, since the values calculated by taking only this mechanism into account provide good estimates for the cross section and the ionization rate constant. For the collisions Ne(3s{sup 3}P{sub 1}) + H{sub 2}, D{sub 2} the ionization process is governed by the exchange mechanism and the cross sections (constants) are close to the corresponding values for metastable atoms Ne(3s{sup 3}P{sub 0,2}). The diffusion coefficients of the excited atoms Ne(3s{sup 1,3}P{sub 1}) in molecular hydrogen and deuterium are also calculated. 34 refs., 6 figs., 1 tab.
- OSTI ID:
- 86384
- Journal Information:
- Soviet Physics - Technical Physics, Journal Name: Soviet Physics - Technical Physics Journal Issue: 9 Vol. 37; ISSN SPTPA3; ISSN 0038-5662
- Country of Publication:
- United States
- Language:
- English
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