Electron-impact-excitation cross sections of lithiumlike ions

摘要: We present an easy to use expression for cross sections of electron-impact-induced 1s{sup 2}nl{r_arrow}1s{sup 2}n{sup {prime}}l{sup {prime}} excitation transitions with 2{le}n{le}n{sup {prime}}{le}4 in multiply charged ions lithium isoelectronic sequence. This is based on our computations by convergent close-coupling (CCC) and Coulomb-Born exchange normalization (CBE) methods. show scaling the CCC CBE atomic number Z this presentation cross-section data. For 6{le}Z{le}30 accurate better than {plus_minus}20{percent} at any energy except vicinity resonances. Contributions from indirect channels do not scale Z; however, calculation rates it enough average locally these contributions over take them into account a frame general scaling-based sections. rates, total inaccuracy caused all simplifications likely be less {plus_minus}30{percent} even most risky cases. assessment comparison computed using sections, high-resolution (CCC R matrix) experimental {copyright} {ital 1997} Themore » American Physical Society}« less