Mainz 2017 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 26: Poster Session II

A 26.30: Poster

Mittwoch, 8. März 2017, 17:00–19:00, P OG1

Coulomb-corrected strong-field quantum orbits beyond the dipole approximation — •Thomas Keil and Dieter Bauer — Institut für Physik, Universität Rostock, 18051 Rostock, Germany

Small nondipole effects in photoelectron spectra of rare gas atoms have been recently observed in experiments using 3.4-micron radiation at 2–8 × 10¹³ W/cm² [1]. Taking nondipole effects into account in 3D simulations based on the time-dependent Schrödinger equation (TDSE), let alone the Dirac equation, are extremely demanding and do not yield much insight into the underlying physics. The plain strong-field approximation (SFA), on the other hand, is oversimplified because it lacks the very essential effect of the Coulomb potential on the outgoing electrons. As a result, differential photoelectron momentum spectra obtained with the plain SFA are in very poor agreement with experiment and TDSE. Coulomb corrections can be incorporated via quantum orbits [2–4], and the equations of motion for these quantum orbits can be easily corrected for taking the v^→×B^→-force into account as well. We analyze the effect of this correction and compare with the experimental findings.

[1] A. Ludwig et al., Phys. Rev. Lett. 113, 243001 (2014).
[2] S.V. Popruzhenko and D. Bauer, J. Mod. Opt. 55, 2573 (2008).
[3] S.V. Popruzhenko et al., Phys. Rev. A 77, 053409 (2008).
[4] Tian-Min Yan et al., Phys. Rev. Lett. 105, 253002 (2010).