Rostock 2019 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 32: Collisions, scattering and correlation phenomena
A 32.3: Vortrag
Donnerstag, 14. März 2019, 14:45–15:00, S HS 3 Physik
Two-center resonant photoionization in slow atomic collisions and strong laser fields — Alexander B. Voitkiv1, Jacqueline Fedyk2, Shaofeng Zhang3, Xinwen Ma3, and •Carsten Müller1 — 1Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf — 2Physikalisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg — 3Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China
Photoionization of an atom A by an electromagnetic field can be strongly enhanced in the presence of a neighbouring atom B, if the latter first is resonantly photoexcited and afterwards transfers the excitation energy radiationlessly to atom A. This two-center process is known to be very efficient, when the atoms constitute a bound system and a single photon of sufficient energy is absorbed from the field. In this contribution we show that, surprisingly, two-center photoionization can also dominate in slow collisions between the atoms A and B, even though the average interatomic distance in this situation exceeds the typical size of a bound system by orders of magnitude [1]. Besides we study two-center ionization by multiphoton absorption from bichromatic laser fields. Experimentally accessible parameter domains, where the process represents the dominant ionization mechanism, are identified here as well [2].
[1] A. B. Voitkiv, C. Müller, S. F. Zhang, X. Ma, arXiv:1809.06526
[2] J. Fedyk, A. B. Voitkiv, C. Müller, Phys. Rev. A 98, 033418 (2018)