Angle-differential electron energy spectra for the autoionization systems He*(2 1S)+H/D(1 2S): Comparison between ab initio theory and experiment (CROSBI ID 130988)
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Podaci o odgovornosti
Movre, Mladen ; Meyer, W. ; Merz, A. ; Ruf, M. -W. ; Hotop, H.
engleski
Angle-differential electron energy spectra for the autoionization systems He*(2 1S)+H/D(1 2S): Comparison between ab initio theory and experiment
We present angle-dependent electron energy spectra due to ionizing collisions ofmetastable He*(2 1S) atoms with ground-state hydrogen and deuterium atoms. The data, measured at thermal collision energies (rel≈ 50 meV), show an angular variation of the spectral shape which is well reproduced by a quantum-mechanical calculation based on local complex potential theory. The ab initio calculated resonance-to-continuum complex coupling elements show a strong dependence on the electronic structure of the quasi-molecule and its changes with internuclear separation. Therefore the total autoionization width shows a significant deviation from a damped exponential shape. Autoionization occurs dominantly into the (molecule fixed) electronic p wave. Calculated total autoionization cross sections are 84 Å ; 2 at Erel = 50 meV. and follow approximately a Erel - 0.5 decay for larger energies. At Erel = 50 meV, associative and quasi-associative processes account for about 12% and 4%, respectively, of the total cross section.
angle-differential ; electron energy spectra ; Penning ionization
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Podaci o izdanju
230 (3)
1994.
276-282
objavljeno
0009-2614
1873-4448
10.1016/0009-2614(94)01157-5