Berlin 2014 – scientific programme

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A: Fachverband Atomphysik

A 15: Poster: Interaction with strong or short laser pulses

A 15.11: Poster

Monday, March 17, 2014, 16:30–18:30, Spree-Palais

Implementation of Infinite-Range Exterior Complex Scaling in B splines — •Alvaro Magana and Alejandro Saenz — AG Moderne Optik, Institut für Physik, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin, Germany

The traditional box-discretization method for describing atoms and molecules in strong laser fields can lead to an inacurrate description of the system due to unphysical reflections at the finite box boundary. The problem can be cured by choosing a sufficiently large box size to describe correctly all the dynamics of the system, but this in turn demands very large computational efforts. The Infinite-Range Exterior Complex Scaling method (Ir-ECS) [1] has been proposed as a way of solving exactly the time-dependent Schrödinger equation (TDSE) within the physically most relevant region, dramatically reducing the numerical effort. In contrast to previous work in which the inner part of the wavepacket was described with a finite-element approach, we successfully implemented Ir-ECS using a mixed B-spline/Legendre basis in order to solve the TDSE. We report a drastic reduction of the total number of states needed for performing a time propagation using the spectral ansatz.

[1] A. Scrinzi, Phys. Rev. A 81, 053845 (2010).