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Phys. Rev. A 62, 062506 (2000) [12 pages]

Resonant x-ray Raman Scattering involving avoided crossings in the final-state potential-energy curves

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P. Sałek1, R. F. Fink2,*, F. Gel’mukhanov1,†, M. N. Piancastelli2,‡, R. Feifer2, M. Bässler2,§, S. L. Sorensen3, C. Miron2,§, H. Wang2,§, I. Hjelte2, O. Björneholm2, A. Ausmees2,**, S. Svensson2, and H. Ågren1
1Theoretical Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden
2Department of Physics, Uppsala University, Box 530, S-75121, Uppsala, Sweden
3Department of Synchrotron Radiation Research, Institute of Physics, University of Lund, Box 118, S-221 00 Lund, Sweden

Received 24 April 2000; published 9 November 2000

The role of avoided crossings for resonant x-ray Raman scattering is explored. The strong dependence of the electronic transition amplitudes on internuclear distance at avoided crossings causes new, and even anomalous, spectral features, and can bring about a breakdown of the generally accepted participator or spectator classification of the transitions. We report, and apply the theory on, an experimental observation of the electron decay of the N 1s⃗π* core-excited level in N2 the B2Σu+ final state with peculiar, non-Franck-Condon, vibrational intensity distributions.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.62.062506
DOI:
10.1103/PhysRevA.62.062506
PACS:
33.20.Rm, 33.50.Dq, 33.70.-w

†Permanent address: Institute of Automation and Electrometry, 630090 Novosibirsk, Russia.

‡Permanent address: Department of Chemical Sciences and Technologies, University “Tor Vergatal,” 00133 Rome, Italy.

*Also at Theoretische Chemie, Ruhr-Universität Bochum D-44780 Bochum, Germany and Department of Theoretical Chemistry, University of Lund, Box 124, S-221 00 Lund, Sweden.

§Also at MAX-lab, University of Lund, S-221 00 Lund, Sweden.

**Also at Institute of Physics, University of Tartu, Riia 142, EE-2400, Tartu, Estonia.

 
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