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Phys. Rev. A 71, 033204 (2005) [7 pages]

Resonant Auger spectroscopy of argon clusters at the 2p threshold

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A. Kivimäki* and S. L. Sorensen
Department of Synchrotron Radiation Research, Institute of Physics, Lund University, Box 118, 22100 Lund, Sweden

M. Tchaplyguine, M. Gisselbrecht, and R. R. T. Marinho†
MAX-lab, Lund University, Box 118, SE-221 00 Lund, Sweden and Department of Physics, Uppsala University, Box 530, SE-751 21 Uppsala, Sweden

R. Feifel‡, G. Öhrwall, S. Svensson, and O. Björneholm
Department of Physics, Uppsala University, Box 530, SE-751 21 Uppsala, Sweden

Received 3 September 2004; published 22 March 2005

Resonant Auger spectra of large argon clusters have been measured at the Ar 2p edge. The decay spectra can give some information on the states reached in photon absorption. For example, the observation of the 3p44p final states indicates the occurrence of the 2p3∕2→4p excitation in clusters, whereas in atoms this excitation is dipole forbidden. Also the 3p43d final states are identified in the resonant Auger spectra. A peculiar finding is that the normal Auger transitions in bulk cluster atoms are observed below the 2p ionization thresholds. This is explained by the excitation of the 2p electrons into the conduction band, followed by a rapid delocalization of the electron.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.71.033204
DOI:
10.1103/PhysRevA.71.033204
PACS:
36.40.Mr, 61.46.+w

*Also at Department of Physical Sciences, University of Oulu, 90014 Oulu, Finland.

†Present address: Department of Physics, Brasilia University, CEP 70910900, Brasilia DF, Brazil.

‡Present address: Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, United Kingdom.

 
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