Probing spin-orbit quenching in Cl (2P) + H2 via crossed molecular beam scattering

B. F. Parsons, K. E. Strecker, D. W. Chandler

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Abstract

In our previous work we investigated electronically non-adiabatic effects in Cl (2P3/2,1/2)+D2 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 Cl (2P3/2)+D2 →Cl* ( 2P1/2)+D2 and electronically non-adiabatic spin-orbit quenching Cl* (2P1/2)+D2 → Cl (2P3/2)+D2. In the present work, we investigate electronically non-adiabatic spin-orbit quenching for Cl* (2P1/2)+H2 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 Å2, σ quench(4.0 kcal/mol) = 21 ± 49 Å2, and σ quench(5.6 kcal/mol) = 14 ± 41 Å2.

Original languageEnglish (US)
Pages (from-to)15-20
Number of pages6
JournalEuropean Physical Journal D
Volume38
Issue number1
DOIs
StatePublished - Apr 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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