Electron capture by fully stripped ions of helium, lithium beryllium and boron from atomic hydrogen

A two-state approximation based on atomic wavefunctions is used to calculate cross sections for electron capture by He 2+ , Li 3+ , Be 4+ and B 5+ from atomic hydrogen in the ground state. The velocity range covered is from v=0.44 to v=2.8 au which corresponds to a laboratory energy range of from 5 to 200 keV amu -1 . Reasonable agreement is obtained with the experimental data for He 2+ , Li 3+ and B 5+ .