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

Chlorine atom spin-orbit product branching ratios and total absolute reacti on 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 measure d Cl-*(P-2(1/2)) atom spin-orbit product branching ratios phi (Cl*)(1.0 eV) = [Cl-*]/[Cl + Cl-*] = (0.06 +/- 0.02), phi (Cl*)(1.4 eV) = (0.07 +/- 0.01 ), and phi (Cl*) (1.7 eV) = (0.16 +/- 0.01) revealed the increasing importa nce of a non-adiabatic reaction channel H + DCl --> HD + Cl-* with increasi ng collision energy. The measured total absolute reaction cross-sections al low for comparison with results from recent quasi-classical trajectory (QCT ) calculations [F.J. Aoiz et al. J. Phys. Chem. A 104 (2000) 10452]. (C) 20 01 Elsevier Science B.V. All rights reserved.