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Determination of the collisional energy transfer distribution responsible for the collision-induced dissociation of NO2 with Ar

Journal Article · · Chemical Physics Letters
 [1];  [1];  [1]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States). Combustion Research Facility
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Collisional energy transfer is an essential aspect of chemical reactivity and maintenance of thermal equilibrium. We report the shape (energy-dependence) of the collisional energy transfer probability function for collisions of vibrationally excited NO2 entrained in a molecular beam and photoexcited to within 40 cm-1 of its dissociation threshold. The internally excited molecules undergo collisions with Ar atoms in a crossed beam apparatus. Dissociative collisions rapidly produce the NO(J) fragment, which is observed by velocity-mapped ion imaging and REMPI techniques. The measured collisional energy transfer function is obtained via energy conservation and is compared with the results of classical trajectory calculations. Good agreement between the theory and experiment is found for collisions that transfer small amounts of energy, but the theory predicts a higher likelihood of energetic collisions than is observed experimentally. We explore possible explanations for this discrepancy in the dynamics of the collision excitation process.

Research Organization:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1497644
Alternate ID(s):
OSTI ID: 1356260
Report Number(s):
SAND2015--4637J; 672344
Journal Information:
Chemical Physics Letters, Journal Name: Chemical Physics Letters Vol. 636; ISSN 0009-2614
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

Figures / Tables (10)

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY