Cooper minima and rotationally resolved resonance enhanced multiphoton ionization spectroscopy

Creators: Rudolph, H.; McKoy, V.

Abstract

We demonstrate that a Cooper minimum, close to threshold, in photoionization via an excited molecular Rydberg state can have a dramatic influence on the ionic rotational branching ratios. It is also shown that this behavior can be exploited to produce ions selectively in a specific rotational level. To illustrate this effect we present the results of ab initio calculations for (2+1′) resonance enhanced multiphoton ionization via the O_(11) (23.5) branch of the H ^2Σ^+(3d,4s) state of NO, where a Cooper minimum is found in l=3 of the kσ and kπ continua at photoelectron kinetic energies of 2.6 eV and 2.9 eV, respectively.

Additional Information

© 1989 American Institute of Physics. Received 18 September 1989; accepted 13 October 1989. The authors acknowledge support from the National Science Foundation (Grant No. CHE-8521391), Air Force Office of Scientific Research (Contract No. 87-0039), and the Office of Health and Environmental Research of the US. Department of Energy (Grant No. DE-FG03-87ER60513). We also made use of resources of the San Diego SuperComputer Center, which is supported by the National Science Foundation. H.R. gratefully acknowledges support from the NATO Science Fellowship Program (Denmark).

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