Hannover 2010 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 7: Poster: Femtosecond Spectroscopy

MO 7.2: Poster

Dienstag, 9. März 2010, 16:00–18:30, Lichthof

Femtosecond pulse shaping and quantum control in multichannel molecular dynamics studied by coincidence imaging — •Carl Stefan Lehmann, Arno Vredenborg, Wim G. Roeterdink, and Maurice H.M. Janssen — Laser Centre and Department of Chemistry, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands

The most complete information on molecular photodissociation and ionisation dynamocs can be obtained by photo-electron / photo-ion coincidence imaging. Coincidence imaging is a technique in which both the ejected photo-electron and the ionic photofragment are measured, in coincidence, with two time- and position sensitive particle detectors. From the data the complete energetic and angular resolved distributions are obtained. In laser excitation of molecules with femtosecond pulses different multiphoton processes are easily induced leading to various ionic atomic and molecular fragment channels. The energy correlation of the electron with its correlated ionic fragment enables to distinguish the competing photon processes. We combine the coincidence imaging technique with the nowadays well-established pulse shaping technique. Pulse shaping provides a tool to control the reaction pathway, thereby controlling the reaction outcome. In this contribution the experimental set-up and the first experimental data on shaping the ultrafast induced dynamics in CH2BrCl will be presented.