Frankfurt 2006 – scientific programme

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A: Atomphysik

A 12: Atomare Systeme in externen Feldern I

A 12.4: Talk

Wednesday, March 15, 2006, 15:00–15:15, H6

Microwave-driven Rydberg atoms: From multiphoton ionisation to Einstein’s photo effect — •Alexej Schelle¹, Artem Dudarev¹, Dominique Delande ², and Andreas Buchleitner ¹ — ¹Max Planck Institut fuer Physik komplexer Systeme Noethnitzer Str. 38, 01187 Dresden - Germany — ²Laboratoire Kastler Brossel, Université Pierre et Marie Curie 4, place Jussieu, 75252 Paris 05 - France

We report on numerically exact ab initio quantum calculations on alkali Rydberg atoms under microwave driving. Here, we focus on the competition between different ionisation processes as the driving field frequency is continuously tuned from multiphoton to single-photon transitions from the atomic initial state to the atomic continuum.
Our numerical results, which are obtained by combining the Floquet picture with R-matrix theory and complex rotation of the Hamiltonian, on the most advanced supercomputing facilties, are compared with recent experimental data for different atomic species.