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Probing spin-orbit quenching in Cl (2P) + H2 via crossed molecular beam scattering
Authors:B F Parsons  K E Strecker  D W Chandler
Institution:(1) Combustion Research Facility, Sandia National Laboratory, 7011 East Ave., Livermore, CA 94550, USA
Abstract:In our previous work we investigated electronically non-adiabatic effects in $\rm Cl~(^{2}P_{3/2,1/2})+D_{2}$ using crossed molecular beam scattering coupled with velocity mapped ion imaging. The prior experiments placed limits on the cross-section for electronically non-adiabatic spin-orbit excitation $\rm Cl~(^{2}P_{3/2})+D_{2} \to Cl^*~(^{2}P_{1/2})+D_{2}$ and electronically non-adiabatic spin-orbit quenching $\rm Cl^*~(^{2}P_{1/2})+D_{2}\to  Cl~(^{2}P_{3/2})+D_{2}$ . In the present work, we investigate electronically non-adiabatic spin-orbit quenching for $\rm Cl^*~(^{2}P_{1/2})+H_{2}$ which is the required first step for the reaction of Cl* to produce ground state HCl+H products. In these experiments we collide Cl (2P) with H2 at a series of fixed collision energies using a crossed molecular beam machine with velocity mapped ion imaging detection. Through an analysis of our ion images, we determine the fraction of electronically adiabatic scattering in Cl* +H2, which allows us to place limits on the cross-section for electronically non-adiabatic scattering or quenching. We determine the following quenching cross-sections σ quench(2.1 kcal/mol) = 26 ± 21 ?2, σ quench(4.0 kcal/mol) = 21 ± 49 ?2, and σ quench(5.6 kcal/mol) = 14 ± 41 ?2.
Keywords:34  50  Lf Chemical reactions  energy disposal  and angular distribution  as          studied by atomic and molecular beams  34  50  Pi State-to-state scattering analyses  34  50  -s Scattering of atoms and molecules
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