Approximate charge and transition energy cross-section scaling for excitation of atoms colliding with multicharged ions
- 1 January 1996
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 53 (1), 219-224
- https://doi.org/10.1103/physreva.53.219
Abstract
Using the adiabatic theory and the dipole close-coupling and classical impulse approximations, scaling relations are derived for the cross sections of dipole-allowed and dipole-forbidden 1S→nL excitation transitions in atoms induced by multiple charged ions of intermediate to high reduced energies. The cross-section scalings incorporate the ionic charge q, the electron transition energy , and the oscillator strength (in the case of optically allowed transitions). The derived scalings describe well the available experimental data for H and He atoms for reduced energies E/q greater than about 25 keV/amu. These scalings also show that, for a fixed energy, the nonscaled excitation cross section as a function of q does not saturate at high q values but decreases after reaching a maximum. © 1996 The American Physical Society.
Keywords
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