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J. Phys.: Conf. Ser. 1412 062006 (2020)

Negative ion relaxation and reactions in a cryogenic storage ring

H T Schmidt1, S Rosén1, R D Thomas1, M H Stockett1, W D Geppert1, Å Larson1, P Löfgren1, A Simonsson1, A Källberg1, P Reinhed1, M Björkhage1, M Blom1, J D Alexander1, P K Najeeb1, M Ji1, N Kono1, E K Anderson1, G Eklund1, M K Kristiansson1, O M Hole1, D Hanstorp2, H Hartman3, P S Barklem4, J Grumer4, K Hansen5,2, M Gatchell6,1, H Cederquist1 and H Zettergren1

1 Stockholm University, Department of Physics, 10691 Stockholm, Sweden

2 University of Gothenburg, Department of Physics, 41296 Gothenburg, Sweden

3 Malm¨o University, Department of Physics, 20506 Malm¨o, Sweden

4 Uppsala University, Department of Physics and Astronomy, 75236 Uppsala, Sweden

5 Tianjin University, Department of Physics, 300072 Tianjin, P R China

6 Universit¨at Innsbruck, Institut f¨ur Ionenphysik und Angewandte Physik, 6020 Innsbruck,Austria

Abstract

An overview of recent experimental results of studies of negative atomic and molecular ions in the Double ElectroStatic Ion-Ring ExpEriment, DESIREE is given. Metastable level lifetimes in atomic negative ions have been measured by time-dependent laser photodetachment. Rotational relaxation of diatomic anions is studied by near-threshold photodetachment. Spontaneous decays of small metal cluster anions by electron emission and fragmentation is studied with decay-channel specificity. Finally, mutual neutralisation of pairs of negative and positive ions has been investigated with initial and final state selectivity.


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