Rotationally resolved threshold photoelectron spectra of OH and OD

Creators: Wiedmann, R. T.; Tonkyn, R. G.; White, M. G.; Wang, Kwanghsi; McKoy, V.

Abstract

The results of combined experimental and theoretical studies of the rotationally resolved photoelectron spectra of OH and OD following single‐photon ionization are presented. The measured zero‐kinetic‐energy (ZEKE) spectra were obtained using pulsed field ionization in conjunction with a vacuum ultraviolet laser source. The OH^+ and OD^+ (X ^3Σ^−, v^+=0) rotational distributions were studied over the range 95.0–95.4 nm. Agreement between the observed and calculated spectra is very encouraging. Improved values for the ionization potentials of OH and OD (104 989 and 105 085 ± 2 cm^(−1), respectively) are reported and the unusual dynamics favoring ΔN<0 transitions are discussed.

Additional Information

© 1992 American Institute of Physics. (Received 28 February 1992; accepted 10 April 1992) Work at Brookhaven National Laboratory was supported by the U.S. Department of Energy, Office of Basic Energy Sciences under Contract No. DE-AC02-76CH00016. Work at the California Institute of Technology was supported by grants from the National Science Foundation, Air Force Office of Scientific Research, and the Office of Health and Environmental Research of the U.S. Department of Energy. We also acknowledge use of resources of the Jet Propulsion Laboratory/Caltech CRAY Y-MP2E/116 Supercomputer.

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