Cooper minima and circular dichroism in photoelectron angular distributions

Journal Article · Thu Nov 15 04:00:00 EST 1990 · Journal of Chemical Physics; (USA)

DOI:https://doi.org/10.1063/1.459377· OSTI ID:6162458

Rudolph, H ^[1]; Dubs, R L ^[2]; McKoy, V ^[1]

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1. Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, CA (USA)
2. National Institute of Standards and Technology, B268-Physics, Gaithersburg, MD (USA)

We demonstrate that circular dichroism in photoelectron angular distributions (CDAD), resulting from resonance enhanced multiphoton ionization (REMPI) of an aligned molecular Rydberg state, is a highly sensitive probe of the presence of a Cooper minimum near threshold. To illustrate this application of CDAD, we present the results of {ital ab} {ital initio} calculations for (1+1{prime}) REMPI via the {ital R}{sub 21}(5.5) branch of the {ital D} {sup 2}{Sigma}{sup +}(3{ital p}{sigma}) state of NO, where a Cooper minimum is found in {ital l}=2 ({ital d} wave) of the {ital k}{pi} continuum at a photoelectron kinetic energy of 3.2 eV. The CDAD signal is found to vary rapidly with photoelectron kinetic energy, go through zero, and change sign in the region of the Cooper minimum. This result is predicted by CDAD theory for photoionization from an aligned atomic {ital p} orbital.

• DOE Contract Number: FG03-87ER60513
• OSTI ID: 6162458
• Journal Information: Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 93:10; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
CHALCOGENIDES
DICHROISM
DISTRIBUTION
ELECTRON SPECTROSCOPY
ENERGY
ENERGY LEVELS
EXCITED STATES
IONIZATION
KINETIC ENERGY
MULTI-PHOTON PROCESSES
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
PHOTOIONIZATION
RYDBERG STATES
SPECTROSCOPY