Probing spin-orbit quenching in Cl (2P) + H2 via crossed molecular beam scattering |
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Authors: | B F Parsons K E Strecker D W Chandler |
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Institution: | (1) Combustion Research Facility, Sandia National Laboratory, 7011 East Ave., Livermore, CA 94550, USA |
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Abstract: | In our previous work we investigated electronically non-adiabatic effects in
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
and electronically non-adiabatic spin-orbit
quenching
.
In the present work, we investigate
electronically non-adiabatic spin-orbit quenching for
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. |
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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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