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Phys Rev Lett. 2010 Apr 02;104(13):133401. doi: 10.1103/PhysRevLett.104.133401. Epub 2010 Mar 31.

Interatomic Coulombic decay following photoionization of the helium dimer: observation of vibrational structure.

Physical review letters

T Havermeier, T Jahnke, K Kreidi, R Wallauer, S Voss, M Schöffler, S Schössler, L Foucar, N Neumann, J Titze, H Sann, M Kühnel, J Voigtsberger, J H Morilla, W Schöllkopf, H Schmidt-Böcking, R E Grisenti, R Dörner

Affiliations

  1. Institut für Kernphysik, J. W. Goethe Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany.

PMID: 20481883 DOI: 10.1103/PhysRevLett.104.133401

Abstract

Using synchrotron radiation we simultaneously ionize and excite one helium atom of a helium dimer (He2) in a shakeup process. The populated states of the dimer ion [i.e., He(*+)(n = 2, 3) - He] are found to deexcite via interatomic Coulombic decay. This leads to the emission of a second electron from the neutral site and a subsequent Coulomb explosion. In this Letter we present a measurement of the momenta of fragments that are created during this reaction. The electron energy distribution and the kinetic energy release of the two He+ ions show pronounced oscillations which we attribute to the structure of the vibrational wave function of the dimer ion.

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