Excitation mechanisms in moderate-energy Li{sup +}-Ar collisions
- Department of Physics, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466 (Japan)
By means of differential energy-transfer measurements, excitation processes in Li{sup +}-Ar collisions have been studied over a wide range of laboratory angles of 2{degree}{le}{theta}{le}92{degree} and at laboratory collision energies of 70{le}E{sub lab}{le}2000 eV. The Li{sup +} and Li atoms scattered inelastically were observed at reduced angles of E{sub lab}{theta}{gt}5 keVdeg, and collision energies of E{sub lab}{ge}200 eV. At 200{le}E{sub lab}{le}350 eV, the inelastic signals are exclusively due to one-electron transitions, while for E{sub lab}{ge}500 eV two-electron excitation as well as one-electron excitation was observed. The electronic transitions in the moderate-energy Li{sup +}-Ar collisions take place at distances of R{lt}R{sub c}=0.81 {Angstrom}. The excitation mechanism for one-electron charge transfer having the largest cross section is investigated in detail by referring to {ital ab initio} potentials. The angular dependence of the differential cross sections of two-electron transitions at higher energies shows three different types of excitations: the first transition takes place around R{sub c}=0.75 {Angstrom}, the second around R{sub c}=0.47 {Angstrom}, and the third around R{sub c}=0.2 {Angstrom}. The first and second transitions are due to noncrossing interactions, while the third is attributed to avoided crossing. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 656921
- Journal Information:
- Physical Review A, Vol. 55, Issue 5; Other Information: PBD: May 1997
- Country of Publication:
- United States
- Language:
- English
Similar Records
Electronic excitation in moderate-energy Li sup + -N sub 2 and Li sup + -CO collisions
Collision-induced intramolecular energy transfer and dissociation of acetone molecular ion