Chlorine atom spin–orbit branching ratios and total absolute reaction cross-sections for the H+DCl→HD+Cl reaction

Abstract

Chlorine atom spin–orbit product branching ratios and total absolute reaction cross-sections have been measured for the H+DCl→HD+Cl gas-phase reaction for collision energies of E col =1.0, 1.4 and 1.7 eV. The measured Cl *( 2 P 1/2) atom spin–orbit product branching ratios φ Cl * (1.0 eV)=[ Cl *]/[ Cl+ Cl *]=(0.06±0.02) , φ Cl * (1.4 eV)=(0.07±0.01) , and φ Cl * (1.7 eV)=(0.16±0.01) revealed the increasing importance of a non-adiabatic reaction channel H+DCl→HD+Cl * with increasing collision energy. The measured total absolute reaction cross-sections allow for comparison with results from recent quasi-classical trajectory (QCT) calculations [F.J. Aoiz et al. J. Phys. Chem. A 104 (2000) 10452].