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APS » Journals » Phys. Rev. Lett. » Volume 86 » Issue 20
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Phys. Rev. Lett. 86, 4504–4507 (2001)

Anionic Photofragmentation of CO: A Selective Probe of Core-Level Resonances

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W. C. Stolte1,2, D. L. Hansen3, M. N. Piancastelli2,4, I. Dominguez Lopez5, A. Rizvi2, O. Hemmers1, H. Wang6, A. S. Schlachter2, M. S. Lubell7, and D. W. Lindle1
1Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154-4003
2Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720
3Earth and Space Sciences Division, Jet Propulsion Laboratory, Pasadena, California 91109-8099
4Department of Chemical Sciences and Technologies, University “Tor Vergata,” 00133 Rome, Italy
5Centro Nacional de Metrologia, C.P. 76900, Queretaro, Mexico
6MAX-Lab, Lund University, 221 00 Lund, Sweden
7Department of Physics, City College of New York, New York, New York 10031

Received 9 November 2000; published in the issue dated 14 May 2001

Anion-yield spectroscopy using x rays is shown to be a selective probe of molecular core-level processes, providing unique experimental verification of shape resonances. For CO, partial anion and cation yields are presented for photon energies near the C K edge. The O- yield exhibits features above threshold related only to doubly excited states, in contrast to cation yields which also exhibit pronounced structure due to the well-known σ* shape resonance. Because the shape resonance is completely suppressed for O-, anion spectroscopy thus constitutes a highly selective probe, yielding information unobtainable with absorption or electron spectroscopy.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.4504
DOI:
10.1103/PhysRevLett.86.4504
PACS:
33.80.Gj, 33.80.Eh
 
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