Probing spin-orbit quenching in Cl (2P) + H2 via crossed molecular beam scattering
Combustion Research Facility, Sandia National Laboratory, 7011 East Ave., Livermore, CA, 94550, USA
Corresponding author: a email@example.com
Revised: 2 December 2005
Published online: 31 January 2006
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 σquench(2.1 kcal/mol) = 26 ± 21 Å2, σquench(4.0 kcal/mol) = 21 ± 49 Å2, and σquench(5.6 kcal/mol) = 14 ± 41 Å2.
PACS: 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
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2006