Hannover 2013 – scientific programme

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A: Fachverband Atomphysik

A 17: Interaction with strong or short laser pulses II

A 17.6: Talk

Tuesday, March 19, 2013, 15:30–15:45, B 302

Strong Field Ionization as Inhomogeneous Schroedinger Equation — •Zachary Walters and Jan-Michael Rost — Max Planck Institute for Physics of Complex Systems, Dresden

The ionization of an atom or molecule by an intense laser field is difficult to describe theoretically, due to the different approaches needed to describe a molecular bound state on one hand and a time dependent continuum state on the other. This talk shows how the time dependent Schroedinger equation can be decomposed into an inhomogeneous equation in which a previously computed initial state acts as a source term for a time dependent tunneling component. By using an improved Hamiltonian approximation to calculate the initial state, a major source of wavefunction error can be reduced or eliminated at a relatively minor computational cost. The gauge invariance of the resulting theory is used to clarify an apparent gauge dependence which has long been noted in the context of strong field S-matrix theory.