Effects of screened Coulomb (Yukawa) and exponential-cosine-screened Coulomb potentials on photoionization of H and He+
Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23, -166, 106 Taipei, Taiwan
Corresponding author: email@example.com
Revised: 23 December 2009
Published online: 26 January 2010
The screening effects due to the exponential-cosine-screened Coulomb and screened Coulomb (Yukawa) potentials on photoionization processes are explored within the framework of complex coordinate rotation method. The energy levels of H and He+ in both screened potentials shifted with various Debye screening lengths are presented. The photoionization cross sections illustrate the considerable screening effects on photoionization processes in low energy region. The shape resonances can be found near ionization thresholds for certain of Debye screening lengths. The relations between the appearance of resonances and the existence of quasi-bound states under shielding conditions are discussed.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2010