2005/11/11 by A. Chattopadhyay, Aparajeo Chattopadhyay, Chittaranjan Sinha +1
Physics and Astronomy · Engineering · #Atomic and Molecular Physics #Laser-Matter Interactions and Applications #Laser-induced spectroscopy and plasma
paper · doi:10.1103/physreva.72.053406
The modification due to an external linearly polarized monochromatic laser field in the dynamics of the ionization process of a hydrogenic ion by electron and positron impact is studied theoretically for coplanar geometry. Significant changes are noted both in the shape and magnitude of the triple-differential cross sections (TDCS) by the application of the laser field. The net effect of the laser field is to suppress the field-free (FF) cross sections in the zeroth-order approximation of the ejected electron wave function, while in the first order the cross sections are found to be enhanced or suppressed depending on the kinematics of the process. The TDCS is found to be quite sensitive with respect to the initial phase as well as the frequency of the laser field. For positron impact, the effect of the laser field on the dynamics of the electron capture to continuum (ECC) phenomena is also studied. No significant change is noted in the qualitative behavior of the FF ECC peak with the application of the laser field.