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

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Scharfenberg,  Ludwig
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Meijer,  Gerard
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Meerakker,  Sebastiaan Y. T. van de
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Scharfenberg, L., Kłos, J., Dagdigian, P. J., Alexander, M. H., Meijer, G., & Meerakker, S. Y. T. v. d. (2010). State-to-state inelastic scattering of Stark-decelerated OH radicals with Ar atoms. Physical Chemistry Chemical Physics, 12(36), 10660-10670. doi:10.1039/C004422A.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0010-F750-B
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.