PUB - Publikationen an der Universität Bielefeld

We investigate multiphoton ejection probability of strongly bound electrons in relativistically intense laser fields. A solvable model of a Klein-Gordon electron bound in a finite-range separable potential and interacting with a circularly polarized plane-wave field is used for the analysis. For binding energies of the order of several keV the rates of electron ejection for omega=100 eV are found to be significant at relativistic intensities but are extremely small for omega=10 eV. For lower binding energies spectra are obtained for the available CO2 laser frequency (omega=0.117 eV) and Nd laser frequency (omega=1.169 eV) Numerical results show the stabilization effect for both relativistic and nonrelativistic intensities and subthreshold frequencies.