State-to-state inelastic scattering of Stark-decelerated OH radicals with Ar atoms

Literature Information

Publication Date 2010-07-23
DOI 10.1039/C004422A
Impact Factor 3.676
Authors

Ludwig Scharfenberg, Jacek Kłos, Paul J. Dagdigian, Millard H. Alexander, Gerard Meijer, Sebastiaan Y. T. van de Meerakker


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Abstract

The Stark deceleration method exploits the concepts of charged particle accelerator physics to produce molecular beams with a tunable velocity. These tamed molecular beams offer interesting perspectives for precise crossed beam scattering studies as a function of the collision energy. The method has advanced sufficiently to compete with state-of-the-art beam methods that are used for scattering studies throughout. This is demonstrated here for the scattering of OH radicals (X2Π3/2, J = 3/2, f) with Ar atoms, a benchmark system for the scattering of open-shell molecules with atoms. Parity-resolved integral state-to-state inelastic scattering cross sections are measured at collision energies between 80 and 800 cm−1. The threshold behavior and collision energy dependence of 13 inelastic scattering channels is accurately determined. Excellent agreement is obtained with the cross sections predicted by close-coupling scattering calculations based on the most accurate ab initio OH + Ar potential energy surfaces to date.

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Physical Chemistry Chemical Physics
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