Selective negative-ion formation from core-valence doubly excited states of the water molecule

Christian Stråhlman, Bruno Moog, Emelie Ertan, Michael Odelius, Antti Kivimäki, Robert Richter, and Rami Sankari

Phys. Rev. A 98, 053432 – Published 26 November 2018

Abstract

This study focuses on the role of negative-ion formation in the decay of core-valence doubly excited water molecules. Combining negative- and positive-ion coincidence measurements with calculated energies of core-valence doubly excited states, we find that $O^{-}$ and $H^{-}$ production is enhanced selectively. In particular, we suggest that $O^{-}$ production is correlated to double occupancy of the antibonding $4 a_{1}$ virtual orbital, while $H^{-}$ appears at electronic states with double occupancy in $2 b_{2}$ . We also show that $H^{-}$ and $O^{-}$ can be created as a result of electron recapture close to the O $1 s$ ionization potential.

Received 13 September 2018

DOI:https://doi.org/10.1103/PhysRevA.98.053432

Physics Subject Headings (PhySH)

Autoionization & Auger processes Photodissociation

Atomic, Molecular & Optical

Authors & Affiliations

Christian Stråhlman^*

Department of Materials Science and Applied Mathematics, Malmö University, 20506 Malmö, Sweden, and MAX IV Laboratory, Lund University, P.O. Box 118, 22100 Lund, Sweden

Bruno Moog

Optoelectronics Research Centre, University of Southampton, Highfield Campus, Hampshire, SO17 1BJ, United Kingdom, and MAX IV Laboratory, Lund University, P.O. Box 118, 22100 Lund, Sweden

Emelie Ertan and Michael Odelius

Department of Physics, Stockholm University, AlbaNova University Center, 10691 Stockholm, Sweden

Antti Kivimäki

Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, 90014 Oulu, Finland, and MAX IV Laboratory, Lund University, P.O. Box 118, 22100 Lund, Sweden

Robert Richter

Elettra–Sincrotrone Trieste, Area Science Park, 34149 Trieste, Italy

Rami Sankari

MAX IV Laboratory, Lund University, P.O. Box 118, 22100 Lund, Sweden

^*christian.strahlman@mau.se

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Issue

Vol. 98, Iss. 5 — November 2018

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