Düsseldorf 2007 – scientific programme

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A: Fachverband Atomphysik

A 23: Poster II - Interaction with strong or short laser pulses

A 23.4: Poster

Thursday, March 22, 2007, 16:30–18:30, Poster B

Keldysh-Faisal-Reiss theory: analytical and numerical analysis — •Yulian Vanne and Alejandro Saenz — AG Moderne Optik, Institut für Physik, Humboldt-Universität zu Berlin, Hausvogteiplatz 5-7, 10117 Berlin, Germany

Various variations of Keldysh-Faisal-Reiss (KFR) theory (also referred to as the strong-field approximation) are often used nowadays to study the interaction of a strong laser pulse with an atomic or molecular system. Although the general formulation of KFR is known for decades, some issues have not been studied in detail yet. We discuss the validity of the saddle-point approximation and a recently published implementation of the residue theorem to calculate the ionization transition amplitude. Also, a careful analytical and numerical analysis of the quasistatic limit of the velocity-gauge KFR is carried out. Based on the Popov-Peremolov-Terent'ev (PPT) quasistatic formula we derive the Coulomb correction for velocity-gauge KFR.