Angle-differential electron energy spectra for the autoionization systems He∗ (2 1S) + H/D(1 2S): Comparison between ab initio theory and experiment
✍ Scribed by M. Movre; W. Meyer; A. Merz; M.-W. Ruf; H. Hotop
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 665 KB
- Volume
- 230
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
We present angle-dependent electron energy spectra due to ionizing collisions of metastable He*(2 'S) atoms with groundstate hydrogen and deuterium atoms. The data, measured at thermal collision energies (I?,,, = 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 .A'at Ere,= 50 meV. and follow approximately a Er;p5 decay for larger energies. At E,,, = 50 meV, associative and quasi-associative processes account for about 12% and 4%, respectively, of the total cross section.