Ejectedenergy differential cross sections for the nearthreshold electronimpact ionization of hydrogen
Abstract
We have calculated, independently, the ^{1}S singly differential cross section for the electronimpact ionization of hydrogen at an incident energy of 4.0 eV above threshold using two different methods: timedependent close coupling and exterior complex scaling. The absolute value of the ^{1}S cross section for equal energy sharing is critical in assessing recent theoretical and experimental results for coplanar triply differential cross sections at low energies. Convergence of the cross section is studied as a function of the number of coupled channels. We find that at this energy the singly differential cross section is relatively flat over the entire ejectedenergy range as predicted by semiclassical calculations.
 Publication:

Physical Review A
 Pub Date:
 May 2001
 DOI:
 10.1103/PhysRevA.63.050701
 Bibcode:
 2001PhRvA..63e0701B
 Keywords:

 34.80.Dp;
 Atomic excitation and ionization by electron impact