[Aspuru-Guzik Group List] ITAMP Special Seminar - Tuesday, June 5 @ 4:00 - Prof. Jan Rost

ITAMP Special Seminar Tuesday, June 5, 2018 4:00 PM, CfA, 60 Garden St., B-105 Prof. Jan Rost, Max Planck Institute for the Physics of Complex Systems “Electron dynamics induced by light pulse derivatives” Attosecond physics with frequencies in the XUV range can achieve pulse durations which are comparable with the time scale of the bound orbital the light pulse couples to. This will give rise to non-adiabatic ionization in which the electron is sensitive to light pulse derivatives. Hence, a simple Gaussian pulse acts like a double pulse and leads to a natural pump probe scenario as well a Stueckelberg oscillations. How large the non-adiabatic effects are depends on the AC Stark shift of the bound orbital. We will illustrate these effects with a simple model of a negative ion. The phenomena discussed link the intrinsic time-scale of the particle coupled to an external oscillating field to its frequency and envelope where the envelope can vary at any time scale provided that the particle’s time scale is comparable or slower. To demonstrate how general these links are we conclude by re-interpreting Fermi’s golden rule in the light of the non-adiabatic ionization perspective. Student Presentation will begin at 4:00 Guest Presentation will begin at 4:30 PM Refreshments will be provided. Samantha Dakoulas Faculty Assistant to Professors Lukin & Greiner & their groups Department of Physics 17 Oxford St., Lyman 324A Cambridge, MA 02138 P. (617) 496-2544