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Phys. Rev. A 71, 010703(R) (2005) [4 pages]

Resonant Auger decay of above-threshold core-excited H2O

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M. N. Piancastelli1, R. Sankari2, S. Sorensen3, A. De Fanis4, H. Yoshida5, M. Kitajima6, H. Tanaka6, and K. Ueda7
1Department of Chemical Sciences and Technologies, University “Tor Vergata,” Rome, Italy
2Department of Physical Sciences, University of Oulu, Finland
3Department of Synchrotron Radiation Research, University of Lund, Sweden
4Japan Synchrotron Radiation Research Institute, Sayo-gun, Hyogo, Japan
5Department of Physical Science, Hiroshima University, Higashi-Hiroshima, Japan
6Department of Physics, Sophia University, Tokyo, Japan
7Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan

Received 15 September 2004; published 18 January 2005

The decay properties of an above-threshold resonance in core-ionized water, which is difficult to identify with usual spectroscopic methods, have been analyzed by resonant Auger spectroscopy. The resonance is shown to correspond to a doubly excited neutral state embedded in the O 1s ionization continuum. The main result of the experiments is the assessment on the dissociative nature of the intermediate state, with a consequent fragmentation in H neutral plus O*H core excited. This dissociation takes place on the same time scale as electron decay, and therefore is categorized as an ultrafast dissociation process.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.71.010703
DOI:
10.1103/PhysRevA.71.010703
PACS:
34.50.Gb, 33.80.Eh, 33.60.−q
 
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