Dynamical screening effects in surface ionization of mono(di)atomic fragmentation: A finite size approach

Abstract

An atomic particle ejected with kinetic energy K from a sample is not perfectly followed by the electron screen neutralizing it in the sample. We study this phenomenon on a limited-size sample with six atoms and electrons. We use a complete determinant basis model, already presented in a previous paper, more accurate than the usual Hartree–Fock one-determinant method. We calculate the R + ionization probability of Li, Na and K at various energies. A study of R +( K 2) is also performed, our result R +( K 2)> R +( K) agrees with the general observation in secondary ion mass spectroscopy experiments on metals.