Frankfurt 2006 – wissenschaftliches Programm
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MO: Molekülphysik
MO 25: Poster: Electronic Spectroscopy
MO 25.3: Poster
Dienstag, 14. März 2006, 16:30–18:30, Labsaal
B state vibrational progression and predissociation of Br2 in Ar matrix — •Heide Ibrahim1, Markus Gühr1,2, and Nikolaus Schwentner1 — 1Institut für Experimentalphysik, Freie Universität Berlin, D-14195 Berlin — 2Stanford Synchrotron Radiation Laboratory, Menlo Park, California 94025-7015
Using a narrow linewidth dyelaser in the visible range (530nm to 640nm) we record high resolution excitation spectra of Br2 in solid Ar, covering the whole vibrationally structured region of the electronic B state. We find narrow features (Zero Phonon Lines with isotope splitting) and structured Phonon Side Bands, reflecting the phonon density of states of the Ar crystal. We detect NIR fluorescence of A, A’ and B state simultaneously with a broadband detector. A two dimensional plot of highly resolved fluorescence versus scanned excitation wavelength illustrates the B state vibrational progression and population transfer from B to the deeper lying A and A’ states. From the systematic behaviour of zero phonon linewidth, vibrational spacing and intensities we identify two cross regions with repulsive states and the corresponding coupling strength.