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Circular dichroism in photoelectron angular distributions as a probe of atomic and molecular alignment

Dubs, Richard L. and Dixit, S. N. and McKoy, V. (1986) Circular dichroism in photoelectron angular distributions as a probe of atomic and molecular alignment. Journal of Chemical Physics, 85 (2). pp. 656-663. ISSN 0021-9606.

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In this paper we show that circular dichroism in photoelectron angular distributions (CDAD) can be used to probe atomic and molecular alignment in the gas phase. Careful choice of photon (left or right circularly polarized) propagation and photoelectron collection directions breaks the cylindrical symmetry of the target, giving rise to dichroic effects. CDAD exists in the electric dipole approximation. We illustrate the sensitivity of CDAD to alignment by considering photoionization of the A 2Sigma+ state of NO. Most of the cases of alignment we consider are created by multiphoton absorption while the others, more general, might be created in fragmentation, desorption, etc. The alignment created by n-photon absorption quickly reaches a classical limit which is reflected in the CDAD spectrum. Finally, we show that CDAD is also a sensitive probe of gas phase atomic state alignment by considering photoionization of the 7P3/2 state of cesium created by single photon absorption from the ground state.

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Additional Information:Copyright © 1986 American Institute of Physics. Received 24 December 1985; accepted 4 April 1986. This material is based upon research supported by the National Science Foundation under Grant No. CHE-8218166. The research reported in this paper made use of the Dreyfus-NSF Theoretical Chemistry Computer which was funded through grants from the Camille and Henry Dreyfus Foundation, the National Science Foundation (Grant No. CHE-7820235), and the Sloan Fund of the California Institute of Technology. One of us (R.L.D.) gratefully acknowledges support through a National Science Foundation Graduate Fellowship. Arthur Amos Noyes Laboratory of Chemical Physics, Contribution No. 7339.
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National Science FoundationCHE-8218166
Camille and Henry Dreyfus FoundationUNSPECIFIED
National Science FoundationCHE-78-20235
Sloan Fund, CaltechUNSPECIFIED
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Arthur Amos Noyes Laboratory of Chemical Physics7339
Issue or Number:2
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ID Code:12252
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Deposited On:31 Oct 2008 00:20
Last Modified:03 Oct 2019 00:26

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