title: Rotationally inelastic scattering of OH by molecular hydrogen: Theory and experiment.
abstract: We present an experimental and theoretical investigation of rotationally inelastic transitions of OH, prepared in the X(2)Π, v = 0, j = 3/2 F1f level, in collisions with molecular hydrogen (H2 and D2). In a crossed beam experiment, the OH radicals were state selected and velocity tuned over the collision energy range 75-155 cm(-1) using a Stark decelerator. Relative parity-resolved state-to-state integral cross sections were determined for collisions with normal and para converted H2. These cross sections, as well as previous OH-H2 measurements at 595 cm(-1) collision energy by Schreel and ter Meulen [J. Chem. Phys. 105, 4522 (1996)], and OH-D2 measurements for collision energies 100-500 cm(-1) by Kirste et al. [Phys. Rev. A 82, 042717 (2010)], were compared with the results of quantum scattering calculations using recently determined ab initio potential energy surfaces [Ma et al., J. Chem. Phys. 141, 174309 (2014)]. Good agreement between the experimental and computed relative cross sections was found, although some structure seen in the OH(j = 3/2 F1f → j = 5/2 F1e) + H2(j = 0) cross section is not understood.
authors.affiliation: Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany.
authors.forename: H Christian
authors.initials: HC
authors.lastname: Schewe
authors.affiliation: Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218-2685, USA.
authors.forename: Qianli
authors.initials: Q
authors.lastname: Ma
authors.affiliation: Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Vanhaecke
authors.affiliation: Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany.
authors.forename: Xingan
authors.initials: X
authors.lastname: Wang
authors.affiliation: Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742-2021, USA.
authors.forename: Jacek
authors.initials: J
authors.lastname: Kłos
authors.affiliation: Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742-2021, USA.
authors.forename: Millard H
authors.initials: MH
authors.lastname: Alexander
authors.affiliation: Molecular and Laser Physics, Institute for Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6265 AJ Nijmegen, The Netherlands.
authors.forename: Sebastiaan Y T
authors.initials: SY
authors.lastname: van de Meerakker
authors.affiliation: Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany.
authors.forename: Gerard
authors.initials: G
authors.lastname: Meijer
authors.affiliation: Theoretical Chemistry, Institute for Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6265 AJ Nijmegen, The Netherlands.
authors.forename: Ad
authors.initials: A
authors.lastname: van der Avoird
authors.affiliation: Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218-2685, USA.
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Dagdigian