Electron-impact excitation of Li to high principal quantum numbers
- Department of Physics, Auburn University, Auburn, Alabama 36849, USA (United States)
The time-dependent close-coupling method is used to calculate electron-impact excitation cross sections for the Li(2s){yields}Li(nl) and Li(2p){yields}Li(nl) transitions at incident energies just above the ionization threshold. The implementation of the time-dependent close-coupling method on a nonuniform lattice allows the study of continuum-coupling effects in excitations to high principal quantum number, i.e., n{<=}10. Good agreement is found with R-matrix with pseudostates calculations, which also include continuum-coupling effects, for excitations to low principal quantum number, i.e., n{<=}4. Poor agreement is found with standard distorted-wave calculations for excitations to all principal quantum numbers, with differences still at the 50% level for n=10. We are able to give guidance as to the accuracy expected in the n{sup 3} extrapolation of nonperturbative close-coupling calculations of low n cross sections and rate coefficients.
- OSTI ID:
- 20640064
- Journal Information:
- Physical Review. A, Vol. 68, Issue 2; Other Information: DOI: 10.1103/PhysRevA.68.022711; (c) 2003 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
Similar Records
Electron-impact ionization of C{sup +} excited states
Excitation and charge transfer in p+H(2s) collisions