Abstract
We present the implementation of a new crossedmolecular beam, velocitymap ionimaging apparatus, optimized for collisions of electronically excited molecules. We have applied this apparatus to rotational energy transfer in NO(A^{2}Σ^{+}, v = 0, N = 0, j = 0.5) + Ar collisions, at an average energy of 525 cm^{1}. We report differential cross sections for scattering into NO(A^{2}Σ^{+}, v = 0, N' = 3, 5, 6, 7, 8 and 9), together with quantum scattering calculations of the DCSs and angle dependent rotational alignment. The differential cross sections show dramatic forward scattered peaks, together with oscillatory behavior at larger scattering angles, while the rotational alignment moments are also found to oscillate as a function of scattering angle. In general, the quantum scattering calculations are found to agree well with experiment, reproducing the forward scattering and oscillatory behavior at larger scattering angles. Analysis of the quantum scattering calculations as a function of total rotational angular momentum indicates that the forward scattering peak originates from the attractive minimum in the potential energy surface at the Nend of the NO. Deviations in the quantum scattering predictions from the experimental results, for scattering at angles greater than 10°, are observed to be more significant for scattering to odd final N'. We suggest that this represents inaccuracies in the potential energy surface, and in particular in its representation of the difference between the N and Oends of the molecule, as given by the oddorder Legendre moments of the surface.
Original language  English 

Article number  204301 
Journal  The Journal of Chemical Physics 
Volume  143 
Issue number  20 
Early online date  23 Nov 2015 
DOIs  
Publication status  Published  28 Nov 2015 
Keywords
 Inelastic scattering
 Potential Energy Surface
 Angular momentum polarization
 Differential cross section
 crossed molecular beams
 velocity map ion imaging
 Energy transfer
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Rotationally Inelastic Scattering of NO(A2Sigma+)+Ar: Differential cross sections and rotational angular momentum polarization
Costen, M. L. (Creator), McKendrick, K. G. (Contributor), Townsend, D. (Contributor), Sharples, T. R. (Contributor) & Luxford, T. F. M. (Contributor), HeriotWatt University, 15 Sept 2015
DOI: 10.17861/3ad18658f7674bf0bb472ba7d9f75683
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