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APS » Journals » Phys. Rev. Lett. » Volume 57 » Issue 14
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Phys. Rev. Lett. 57, 1707–1710 (1986)

Near-Threshold Measurements of the C 1s Satellites in the Photoelectron Spectrum of CO

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A. Reimer, J. Schirmer*, J. Feldhaus, and A. M. Bradshaw
Fritz-Haber-Institut der Max-Planck-Gesellschaft, D-1000 Berlin 33, West Germany

U. Becker, H. G. Kerkhoff, B. Langer, D. Szostak, and R. Wehlitz
Institut für Strahlungs- und Kernphysik, Technische Universität Berlin, D-1000 Berlin 12, West Germany

W. Braun
Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung mbH (BESSY), D-1000 Berlin 33, West Germany

Received 5 August 1986; published in the issue dated 6 October 1986

The cross sections and asymmetry parameters of the two π-π*2Σ+ shakeup satellites on C 1s in the photoelectron spectrum of CO are found to differ significantly in the threshold region. The first satellite (due to triplet π-π* coupling) shows intensity enhancement near threshold whereas the second satellite (singlet π-π* coupling) decreases in intensity as expected for the adiabatic limit. Moreover, the data indicate that a shape resonance in the first-satellite channel is responsible for the observed effect rather than a conjugate shakeup process.

© 1986 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.57.1707
DOI:
10.1103/PhysRevLett.57.1707
PACS:
33.20.Rm, 33.60.Fy

*Permanent address: Physikalisch-Chemisches Institut, Universität Heidelberg, D-6900 Heidelberg, West Germany.

 
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