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A: Fachverband Atomphysik

A 24: Attosecond physics

A 24.5: Vortrag

Mittwoch, 25. März 2015, 15:30–15:45, C/kHS

Time Delays in Two-Photon Ionization — Jing Su¹, •Hongcheng Ni^1,2, Agnieszka Jaron-Becker¹, and Andreas Becker¹ — ¹JILA and Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA — ²Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Straße 38, 01187 Dresden, Germany

We study the time delays in two-photon ionization of the helium atom. We find that in the case of a nonresonant transition the absorption of the two photons occurs without time delay. In contrast, for a resonant transition a substantial absorption time delay is present, which scales linearly with the duration of the ionizing pulse. The two-photon absorption time delay can be related to the phase acquired during the transition of the electron from the initial ground state to the continuum.