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Phys. Rev. Lett. 98, 223202 (2007) [4 pages]

Crossed Beam Photodissociation Imaging of HeH+ with Vacuum Ultraviolet Free-Electron Laser Pulses

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H. B. Pedersen1,*, S. Altevogt1, B. Jordon-Thaden1, O. Heber2, M. L. Rappaport2, D. Schwalm1, J. Ullrich1, D. Zajfman1,2, R. Treusch3, N. Guerassimova3, M. Martins4, J.-T. Hoeft4, M. Wellhöfer4, and A. Wolf1
1Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany
2Department of Particle Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
3HASYLAB, DESY, Hamburg, Germany
4Institut für Experimentalphysik, Universität Hamburg, D-22761 Hamburg, Germany

Received 21 February 2007; published 1 June 2007

Molecular photofragmentation has been studied by event imaging on HeH+ ions at 32 nm (38.7 eV) in a fast ion beam crossed with the free-electron laser in Hamburg (FLASH), analyzing neutral He product directions and energies. Fragmentation into He(1snl,n≥2)+H+ was observed to yield significant photodissociation at 32 nm with an absolute cross section of (1.4±0.7)×10-18  cm2, releasing energies of 10–20 eV. A clear dominance of photodissociation perpendicular to the laser polarization was found in contrast to the excitation paths so far emphasized in theoretical studies.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.223202
DOI:
10.1103/PhysRevLett.98.223202
PACS:
34.80.Gs

*To whom correspondence should be addressed.

Electronic address: henrik.pedersen@mpi-hd.mpg.de

 
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