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MO: Molekülphysik
MO 11: VUV Spectroscopy
MO 11.1: Talk
Monday, March 13, 2006, 11:00–11:15, H10
Two-Color Photoionization of Bromine — •Jürgen Plenge1,2, Christophe Nicolas3, Alison Caster2, Musa Ahmed3 und Stephen R. Leone2,3 — 1Institut für Physikalische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg — 2Departments of Chemistry and Physics, University of California, Berkeley, California 94720 — 3Lawrence Berkeley National Laboratory, Berkeley, California 94720
Two-color photoionization of molecular bromine (Br2) has been studied by photoelectron spectroscopy using vacuum ultraviolet (VUV) synchrotron radiation and visible Nd:YLF laser light. The experiments were carried out on the Chemical Dynamics Beamline at the Advanced Light Source (Berkeley, USA). The second harmonic of the 1 kHz pulsed Nd:YLF laser was used to excite the X( 1 Σg, v″ =0) → B (3Π, v′ = 28,29) transitions of Br2 near 527 nm. The long-lived B(3 Π) state of Br2 was ionized using VUV radiation in the photon energy range 8.5-10 eV. The ejected photoelectrons were detected utilizing a velocity map imaging detector and photoelectron energy distributions were measured. The obtained two-color photoionization spectra are compared with VUV one-color photoionization spectra. Distinct differences in the photoelectron kinetic energy distributions of both photoionization schemes are observed and discussed with the aid of Franck-Condon calculations.