Interatomic Coulombic Decay following Photoionization of the Helium Dimer: Observation of Vibrational Structure

Details Interatomic Coulombic Decay following Photoionization of the Helium Dimer: Observation of Vibrational Structure Interatomic Coulombic Decay following Photoionization of the Helium Dimer: Observation of Vibrational Structure

2010-06-14

arxiv.org/abs/1006.2664v1

Phys. Rev. Lett. 104, 133401 (2010)

Physics

Atomic and Molecular Clusters

8 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.104.133401

Using synchrotron radiation we simultaneously ionize and excite one helium atom of a helium dimer (He_2) 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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