Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 1: Interaction with strong or short laser pulses I
A 1.3: Vortrag
Montag, 12. März 2012, 11:15–11:30, V55.01
Trajectory-based Coulomb-corrected strong field approximation — •Tian-Min Yan1, 2, Sergey Popruzhenko3, and Dieter Bauer1 — 1Institut für Physik, Universität Rostock, 18051 Rostock, Germany — 2Max-Planck-Institut für Kernphysik, Postfach 103980, 69029 Heidelberg, Germany — 3Moscow Engineering Physics Institute, National Research Nuclear University, Kashirskoe Shosse 31, 115409 Moscow, Russia
We present a semi-classical theory for atoms in strong laser fields, the trajectory-based Coulomb-corrected strong field approximation (TCSFA). The method relies on the widely-used strong field approximation (SFA). Using the saddle point approximation, the concept of quantum orbits—inherent in the SFA—allows for an incorporation of the long-range Coulomb interaction with the emitted electron. By comparisons with ab initio solutions of the time-dependent Schrödinger equation we show that the Coulomb interaction significantly alters the electron dynamics. The TCSFA method is used to calculate doubly-differential momentum distributions of photo-electrons, especially for the low-energy regime where the plain SFA fails. The TCSFA is particularly convenient for a detailed analysis of the ionization dynamics at relatively low computational demand. In fact, the understanding of spectral features in terms of interfering quantum orbits yields the maximum insight possible in nonperturbative quantum dynamics. The applicability of the method for different laser parameters is discussed.