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Title:EFFICIENT SUPER ENERGY TRANSFER COLLISIONS THROUGH REACTIVE-COMPLEX FORMATION: H + SO2
Author(s):Smith, Jonathan M.
Contributor(s):Dai, HAI-LUNG; Ma, Jianqiang; Wilhelm, Michael J.
Subject(s):Dynamics/Kinetics/Ultrafast
Abstract:Translational-to-vibrational energy transfer (ET) from a hyperthermal H atom to ambient SO$_{2}$ was characterized using time-resolved Fourier transform infrared emission spectroscopy. Vibrational excitation of SO$_{2}$, following collisions with H atoms containing 59 kcal/mol of kinetic energy, generated from the 193 nm photolysis of HBr, is detected in two distinct energy distributions: one with excitation predominantly at the fundamental vibrational levels is attributable to classical impulsive collisions, while the other, accounting for 80% of the excited SO$_{2}$ with vibrational energy as high as 14,000 wn, is proposed to arise from the formation of a transient reactive-complex during the collision. The cross-section for this super ET collision is determined to be 0.53$pm$0.05 AA$^{2}$, or roughly 2% of all hard sphere collisions. This observation reveals that in collisions between a hyperthermal atom and an ambient molecule, for which a reactive-complex exists on the potential energy surface, a large quantity of translational energy can be transferred to the molecule with high efficiency.
Issue Date:23-Jun-15
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:ACS
Genre:CONFERENCE PAPER/PRESENTATION
Type:Text
Language:English
URI:http://hdl.handle.net/2142/79400
Date Available in IDEALS:2016-01-05


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