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Physics and Astronomy

Physics & Astronomy Colloquium

3:30 PM, Friday, April 3, 2009
Room 155, Chem-Phys Building

Dr. Klaus Bartschat
Department of Physics and Astronomy
Drake University

Our group recently developed a general method [1] to solve the time-dependent Schrödinger equation for the interaction of a strong laser pulse with a general atom, i.e., beyond the models of quasi-one or quasi-two-electron targets. The field-free hamiltonian matrices are generated in a B-spline R-matrix (close-coupling) method [2], and the laser field is coupled in through dipole matrices generated with the same program. The major advantages of our approach are i) its generality and ii) the possibility of generating highly accurate target descriptions with small configuration interaction expansions. We propagate the solution of the TDSE by the Arnoldi method [3]. Various numerical implementations will be discussed and example results for a variety of processes, including excitation as well as single and double ionization of He, Ne, and Ar will be presented. [1] X. Guan, O. Zatsarinny, K. Bartschat, B. I. Schneider, J. Feist, and C.J. Noble, Phys. Rev. A 76, 053411 (2007). [2] O. Zatsarinny, Comp. Phys. Commun. 174, 273 (2006). [3] T. J. Park and J. C. Light, J. Chem. Phys. 85, 5870 (1986).

Refreshments will be served in CP 177 at 3:15 PM