Heidelberg 2015 – scientific programme
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MO: Fachverband Molekülphysik
MO 13: Collisions & Energy Transfer
MO 13.3: Talk
Wednesday, March 25, 2015, 11:45–12:00, PH/SR106
Dissociative Recombination measurements of SH+ — •Arno Becker1, Christian Domesle1, Wolf Geppert2, Claude Krantz1, Oldřich Novotný1,3, Daniel Savin3, Dirk Schwalm1,4, Bian Yang5, and Andreas Wolf1 — 1Max-Planck-Institut für Kernphysik, Heidelberg — 2Stockholm University, Stockholm, Sweden — 3Columbia Astrophysics Laboratory, New York, USA — 4Weizmann Institute of Science, Rehovot, Israel — 5Chinese Academy of Sciences, Lanzhou, PRC
Astrophysicists observe trace molecules to investigate the properties of interstellar medium. SH+ is believed to be a very efficient probe for energetic interstellar environments, such as shocked gas. To interpret the observations, however, the models need reliable experimental data on dissociative recombination (DR) of SH+.
To this end we have experimentally investigated DR of SH+ at the Test Storage Ring (TSR) of the Max Planck Institute for Nuclear Physics in Heidelberg, Germany. An SH+ beam was merged with a cold electron beam produced by a photo-cathode. Utilizing an energy sensitive Si detector, recombination rate coefficients were determined for collision energies ranging from sub-meV up to 6 eV, covering kinetic temperatures down to 10 K. Moreover, we have determined branching ratios for various product excitation states utilizing a position sensitive microchannel plate detector. Here, we have employed a novel approach requiring detection of only one fragmentation partner. The method will be a valuable tool for analyzing imaging data of the heavier molecules to be stored in the upcoming Cryogenic Storage Ring (CSR).