Laser assisted excitation ( to n=2 level ) of a hydrogenic ion inside a plasma medium.

A. Chattopadhyay, C. Sinha

Theoretical Physics Department, Indian Association for the Cultivation of Science, Jadavpur, Calcutta - 700032, India.

We propose an approach to study the inelastic collision strengths as well as differential cross sections (DCS) of a ground state hydrogenic ion under the simultaneous action of fast electron impact and a single mode, linearly polarized laser field inside a plasma medium [1, 2]. The calculations are performed in the framework of first order approximation for such collision processes. The dressed excited states (for n=2 level) of the hydrogenic ion is constructed using first order perturbation theory in the parabolic coordinate representation, which is the correct prescription for such laser assisted excitation process. In the present calculation we have made use of the following two assumptions.
(1) The laser frequency is low (soft photon limit).
(2) The plasma frequency is much higher than the laser frequency.
Detailed results will be presented at the Conference.

References

[1] G. J. Hatton, N. F. Lane and J C Weisheit, J. Phys. B : At. Mol. Phys. 14 (1981) 4879.
[2] R. S. Pundir and K. C. Mathur, J. Phys. B : At. Mol. Phys. 17 (1984) 4245.