Dresden 2011 – scientific programme

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MO: Fachverband Molekülphysik

MO 35: Spectroscopy in He Droplets

MO 35.2: Talk

Friday, March 18, 2011, 10:45–11:00, MER 02

Ultrafast relaxation and emission of Rydberg He atoms from excited He droplets — •Oleg Kornilov^1,3, Oliver Bünermann^2,3, Oliver Gessner³, Daniel Haxton³, Daniel Neumark^3,4, and Stephen Leone^3,4 — ¹Max-Born-Institute, Berlin — ²Institute for Physical Chemistry, Georg-August-University Göttingen — ³Ultrafast X-ray Science Laboratory, Chemical Sciences Division, Lawrence Berkeley National Laboratory — ⁴Department of Chemistry, University of California, Berkeley

Real time dynamics of electronically excited pure He droplets is studied by time-resolved photoelectron spectroscopy. The droplets are excited by a femtosecond EUV pulse into an excitation band centered at 23.8 eV and are probed by 785 nm pulses. Transient angular distributions of photoelectrons reveal emission of atoms in excited Rydberg states. Perturbed Rydberg states model of the droplet excited band is formulated. Photoelectron spectra calculated on this assumption are in good agreement with observations. Comparison to the results of a complimentary photoion study helps to follow fragmentation of excited and ionized droplets.