Stuttgart 2012 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 9: Electron scattering and recombination

A 9.3: Vortrag

Montag, 12. März 2012, 17:00–17:15, V57.05

Dissociative recombination of NH+: collision energy dependence of atomic product states — •Bian Yang1,2,4, Oldřich Novotný1,3, Max Berg1, Dennis Bing1, Henrik Buhr1,6, Christian Domesle1, Wolf D. Geppert5, Florian Grussie1, Claude Krantz1, Mario Mendes1, Christian Nordhorn1, Daniel Wolf Savin3, Dirk Schwalm1,6, and Andreas Wolf11MPI, MPIK, D-69117 Heidelberg, Germany — 2IMP, CAS, Lanzhou 730000, People’s Republic of China — 3Columbia Astrophysics Laboratory, Columbia University, New York 10027, USA — 4Graduate University of CAS, Beijing 100049, People’s Republic of China — 5Molecular Physics, Stockholm University, SE-10691 Stockholm, Sweden — 6Weizmann Institute of Science, 76100 Rehovot, Israel

The dissociative recombination (DR) of NH+ has been experimentally investigated at the storage ring TSR of the MPIK in Heidelberg, using fast merged ion and electron beams. A newly developed mass sensitive imaging detector enabled us to map the branching ratios over collision energies Ed = 0 - 12 eV showing unprecedented detail. Fragment ground states, N(4So) + H(2S), are almost not populated at all collision energies covered. At Ed < 0.02 eV, product channels N(2Do) + H(2S) and N(2Po) + H(2S) dominate at nearly equal fractions. For Ed > 0.02 eV additional product channels become energetically accessible. Their branching ratios display rich structure highly sensitive to collision energy. We combine the branching ratios with an independently measured total absolute DR rate coefficient, providing partial rate coefficients towards particular atomic product states.

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