LETTER TO THE EDITOR: The validity of classical trajectory and perturbative quantal methods for electronimpact ionization from excited states in Hlike ions
Abstract
To test the validity of classical trajectory and perturbative quantal methods for electronimpact ionization of Hlike ions from excited states, we have performed advanced closecoupling calculations of ionization from excited states in H, Li^{2+} and B^{4+} using the Rmatrix with pseudo states and the timedependent closecoupling methods. Comparisons with our classical trajectory Monte Carlo (CTMC) and distortedwave (DW) calculations show that the CTMC method is more accurate than the DW method for H, but does not improve with n and grows substantially worse with Z, while the DW method improves with Z and grows worse with n.
 Publication:

Journal of Physics B Atomic Molecular Physics
 Pub Date:
 June 2005
 DOI:
 10.1088/09534075/38/12/L01
 Bibcode:
 2005JPhB...38L.199G