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Journal Article

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

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Schöllkopf,  Wieland
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Havermeier, T., Jahnke, T., Kreidi, K., Wallauer, R., Voss, S., Schöffler, M., et al. (2010). Interatomic Coulombic Decay following Photoionization of the Helium Dimer: Observation of Vibrational Structure. Physical Review Letters, 104, 133401-1-133401-4. doi:10.1103/PhysRevLett.104.133401.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0010-F5E6-B
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.