Dresden 2011 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 21: Electronic Spectroscopy I
MO 21.4: Vortrag
Donnerstag, 17. März 2011, 11:15–11:30, MER 02
Absolute cross section of ionization, dissociation and fluorescence of H2 superexcited states — Michele Glass-Maujean1, Christian Jungen2, Hans Schmoranzer3, •Irina Tulin-Haar4, Andrè Knie4, Philipp Reiß4, Rainer Hentges4, Witoslaw Kielich4, Kari Jänkälä4, and Arno Ehresmann4 — 1Laboratoire de Physique Molèculaire pour l*Atmosphère et l*Astrophysique, Universitè Pierre et Marie Curie, 4 place Jussieu, 75252 Paris Cedex 05, France — 2Laboratoire Aimè Cotton du CNRS, Batiment 505, Universitè de Paris-Sud, F-91405 Orsay, France — 3Fachbereich Physik, Technische Universität Kaiserslautern, D-67653 Kaiserslautern — 4Institut für Physik, Universität Kassel, D-34132 Kassel, Germany
Absolute cross sections of three competing decay channels, namely ionization, dissociation and fluorescence, were determined after excitation of superexcited states of the hydrogen molecule. The experimental data was recorded by irradiating H2 with VUV photons (14.8 eV - 16 eV) at the U125/2-10m-NIM beamline (BESSY II, Berlin).
In addition to the absolute cross section of the decay processes: autoionization σion, predissociation σdis and molecular fluorescence σfluo the absolute absorption cross section σabs was determined. Measuring the complete cross section data set of absorption and all decay channels, this experiment allows a cross validation of the individual decay channels. The measured data has been compared to MQDT calculation and allows the identification of the intermediate superexcited molecular states.