A new theoretical approach to collision-induced autoionization in atom—diatom systems with repulsive interactions
✍ Scribed by J. Vojtík
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 502 KB
- Volume
- 214
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
A two-dimensional classical trajectory model of the dynamics of the ionization event in low-energy collisions in repulsive autoionizing A* t BC systems is introduced. The approach makes full use of the fact that before the ionization event A* t BC( u") + [ A...BC+ ( v' ) ] t e-taking place in repulsive systems, the BC coordinate is weakly coupled to the remaining ones. A separate quantum mechanical treatment of the perturbed BC( u") [ BC+ (u') ] vibrational motion is adopted and included into the calculation of static characteristics of the system which thus depend on the A*-BC distance R, the A*-BC angle y and the pertaining vibrational quantum numbers of the perturbed BC and BC+. The BC collision partner is treated as a rigid rotor. Test calculations on He(2 IS)-H~(zJ"=~) with collision energy ranging from 10 to 150 meV (the average 251 meV) are presented. The approach is found to yield a picture of the He(2 3S) tHs(rY=O)-t [He...H$ (v')] te-ionization event, which is close to that provided by precise Penning electron spectra measurements.