University of Connecticut

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Atomic, Molecular, and Optical Physics Seminar

Thursday, November 1, 2018
2:00pm – 3:00pm

Storrs Campus
Gant West Building (aka Physics Building), GW121

Dr. Aaron LaForge, Department of Physics, University of Connecticut

Excitation dynamics in helium nanodroplets induced by XUV radiation

As opposed to purely molecular systems where electron dynamics proceed only through intramolecular processes, weakly-bound complexes like helium nanodroplets offer an environment where local excitations can interact with neighboring molecules leading to new intermolecular relaxation mechanisms. Here, we present a systematic, time-resolved study of the excitation dynamics when helium nanodroplets are resonantly excited by XUV free electron laser radiation. At low pulse energy, a single atom is excited leading to the formation of a bubble state which relaxes to the droplet surface on a femtosecond timescale. At high pulse energy, a network of excited atoms is formed within a nanodroplets which then collectively autoionizes with high efficiency. Using the pump-probe technique, we were able to time resolve this process.

Contact:

Prof. N. Berrah

Physics Department (primary), UConn Master Calendar

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