3 years ago

Suppression of strong-field effects in photoionization of the single active electron of alkali atoms.

Tobias Kroker, Bernhard Ruff, Markus Drescher, Juliette Simonet, Klaus Sengstock, Philipp Wessels

We investigate experimentally the ionization of genuine single active electron atoms in strong light fields accessing a regime where the Keldysh parameter is close to unity and nominally all transition scenarios of multiphoton-, tunnel-, and over-the-barrier ionization can take place. Surprisingly, we observe a clear dominance of multiphoton ionization even at high peak intensities exceeding the over-the-barrier-ionization threshold. Our fully quantitative approach relies on exposing trapped ultracold $^{87}$Rb atoms to intense femtosecond laser pulses and directly measuring the imprinted atomic loss fraction. We are able to extract absolute ionization probabilities and cross-sections for testing the validity of theoretical models under debate in the so called transitional non-adiabatic tunneling regime.

Publisher URL: http://arxiv.org/abs/1711.01875

DOI: arXiv:1711.01875v1

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