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Circular dichroism in photoemission from oriented molecules at surfaces

Westphal, C. and Bansmann, J. and Getzlaff, M. and Schönhense, G. and Cherepkov, N. A. and Braunstem, M. and McKoy, V. and Dubs, R. L. (1991) Circular dichroism in photoemission from oriented molecules at surfaces. Surface Science, 253 (1-3). pp. 205-219. ISSN 0039-6028. doi:10.1016/0039-6028(91)90593-H.

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Measurements of a new observable quantity in photoemission from oriented molecules are reported. Using circularly polarized radiation, the photoemission intensities for a special geometry were found to depend on photon helicity. The basic theoretical description of the effect is outlined, showing that it occurs for all spatially fixed molecules in the electric dipole approximation and does not depend on electron-spin effects. Experimental case studies for diatomics (CO, NO), benzene, and the “heavy” molecule CH_3I, all oriented by adsorption on Pd(111) or graphite (0001), reveal huge intensity asymmetries in all cases. Comparisons of these measured asymmetries are also made with the results of model calculations based on oriented CO, NiCO, and NO. The effect provides a sensitive probe of molecular orientation and of photoemission dynamics.

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Additional Information:© 1991 Elsevier Science Publishers B.V. Received 6 November 1990; accepted for publication 30 January 1991. Available online 19 September 2002. Contribution Number 8033. The authors thank G. Raseev (Orsay) for useful discussions and correspondence. N.A.C. acknowledges the hospitality of the Laboratoire de Photophysique Moleculaire, Université de Paris-Sud, extended to him during the work on this paper, and the financial support of the Centre National de la Recherche Scientifique. The excellent cooperation of the staff of BESSY is gratefully acknowledged. R.L.D. gratefully acknowledges support under a National Research Council Resident Research Associateship. Work at the University of Bielefeld was supported by BMFT (05 331 AXI). Work at the California Institute of Technology was supported by the Air Force Office of Scientific Research through Grant No. AFOSR-89-0132 and the National Science Foundation (CHE-8521391). We also acknowledge the use of resources of the San Diego Supercomputer Center which is supported by the National Science Foundation.
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Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
National Research Council Resident Research AssociateshipUNSPECIFIED
BMFT05 331 AXI
Air Force Office of Scientific Research (AFOSR)AFOSR-89-0132
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Caltech Arthur Amos Noyes Laboratory of Chemical Physics8033
Issue or Number:1-3
Record Number:CaltechAUTHORS:20151117-122643342
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Official Citation:Circular dichroism in photoemission from oriented molecules at surfaces Pages 205-219 C. Westphal, J. Bansmann, M. Getzlaff, G. Schönhense, N.A. Cherepkov, M. Braunstem, V. McKoy, R.L. Dubs
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:62165
Deposited By: Ruth Sustaita
Deposited On:17 Nov 2015 23:47
Last Modified:10 Nov 2021 22:58

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