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Clusters, Radicals, and Ions; Environmental Chemistry
Differential Cross Sections for State-to-State Collisions of NO(v=10) in Near-Copropagating Beams Chandika Amarasinghe, Hongwei Li, Chatura Perera, Matthieu Besemer, Ad van der Avoird, Gerrit C. Groenenboom, Changjian Xie, Hua Guo, and Arthur G. Suits J. Phys. Chem. Lett., Just Accepted Manuscript • DOI: 10.1021/acs.jpclett.9b00847 • Publication Date (Web): 25 Apr 2019 Downloaded from http://pubs.acs.org on April 30, 2019
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The Journal of Physical Chemistry Letters
Differential Cross Sections for State-to-State Collisions of NO(v=10) in Near-Copropagating Beams
Chandika Amarasinghe1, Hongwei Li1, Chatura A. Perera1, Matthieu Besemer2, Ad van der Avoird2, Gerrit C. Groenenboom2, Chengjian Xie3, Hua Guo3, and Arthur G. Suits1* 1Department
of Chemistry, University of Missouri, Columbia, Missouri 65211, USA
2Radboud
University, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands 3Department
of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, USA Abstract State-to-state differential cross sections for rotationally inelastic collisions of vibrationally excited NO with Ar have been measured in a near-copropagating crossed beam experiment at collision energies of 530 and 30 cm-1. Stimulated emission pumping (SEP) to prepare NO in specific rovibrational levels is coupled with direct-current slice velocity map imaging to obtain a direct measurement of the differential cross sections. The use of nearly copropagating beams to achieve low NO-Ar collision energies and broad collision energy tuning capability are also demonstrated. The experimental differential cross sections (DCSs) for NO in v=10 in specific rotational and parity states are compared with the corresponding DCSs predicted for NO in v=0 obtained from quantum mechanical close coupling calculations to highlight the differences between the NO(v=10)-Ar and NO(v=0)- Ar interaction potentials.
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Powerful techniques have emerged in recent years enabling the study of chemical dynamics in the cold and ultracold regime.1-8 Under these conditions, quantum phenomena such as scattering resonances dominate, and new opportunities for quantum-controlled reactions and stereodynamics arise. Although there are some favorable instances where one can observe resonances at high energies, in general the pure quantum nature of a reaction becomes easily discernable only at low temperatures/energies where few partial waves contribute to the collision.9 Recently, there have been many experimental advances to achieve conditions suitable for detecting these quantum effects in collision. Experimental observation of such effects was first reported by Ye and coworkers for reaction of alkali dimers with alkali atoms.2 This involved quantum state preparation of the diatomics in their absolute ground state using Feshbach resonances, and reacting with the alkali atoms in a trap. Instead of pre-cooling the reactants to ultracold (
