Iteration wave function for describing the (e, 2e) spectrum of the helium atom
Abstract
The wave function of the ground state of the helium atom is derived by the variationaliteration technique with the HylleraasEckart momentum representation of the wave function as a first approximation. This function is used to calculate the ratios of the differential cross sections σ(n=2)/σ(n=1) and σ(2p)/σ(2s) for helium ionized by an electron impact. The calculation is conducted in the planewave impulse approximation for symmetric noncoplanar kinematics of the (e, 2e) process. The results are compared with previous calculations in which variational wave functions of the configurational interaction type were used. Good agreement with the existing experimental data for σ(n=2)/σ(n=1) is obtained. The results are generalized to helium ions.
 Publication:

Soviet Physics Journal
 Pub Date:
 December 1986
 DOI:
 10.1007/BF00896001
 Bibcode:
 1986SvPhJ..29..990I