TY - JOUR
T1 - Absolute rate constants, reactive cross-sections and isotopic branching ratio for the reaction of O(1D) with HD
AU - Laurent, T.
AU - Naik, P. D.
AU - Volpp, H. R.
AU - Wolfrum, J.
AU - Arusi-Parpar, T.
AU - Bar, I.
AU - Rosenwaks, S.
N1 - Funding Information:
The authors gratefully acknowledge financial support of the Alexander von Humboldt Stiftung, the Max Planck Gesellschaft, the Deutsche Forschungs-gemeinschaft and the EC. Thanks are due to S. Koppe for his contributions in the early stage of the experiment and A. Melchior for helpful communications. HRV wants to thank G.C. Schatz for his kind hospitality and numerous valuable discussions during
Funding Information:
a stay at Northwestern University (Evanston). PDN thanks the KFA Jiilich for a fellowship under the Indo-German bilateral agreement.
PY - 1995/4/13
Y1 - 1995/4/13
N2 - Using the laser photolysis vacuum-UV laser-induced fluorescence 'pump-and-probe' technique, Doppler profiles of H and D atoms from the reaction O(1D) + HD were measured under single-collision conditions, O(1D) atoms were generated by laser photolysis of N2O at 193 nm. With a calibration method using HCl photolysis as a source of well defined H atom concentrations the following absolute rate constants k and absolute reactive cross-sections σR have been determined: k = (1.3 ± 0.3) × 10-10 cm3s-1 molec-1 and σR(0.14 eV) = 4.0 ± 0.9 Å2 for the reaction channel O(1D) + HD → OD + H, and k = (1.0 ± 0.3) × 10-10 cm3 s-1 molec-1 and σR(0.14 eV) = (3.0 ± 0.7) Å2 for the reaction channel O(1D) + HD → OH + D. The isotopic branching ratio for the reaction O(1D) + HD was measured directly to be ΓH/D = 1.35 ± 0.20. In addition, from the measured H and D atom Doppler profiles the fraction f{hook}T of the available energy released as translational energy was determined for the individual product channels to be f{hook}T(OD + H) = 0.41 ± 0.07 and f{hook}T(OH + D) = 0.32 ± 0.05.
AB - Using the laser photolysis vacuum-UV laser-induced fluorescence 'pump-and-probe' technique, Doppler profiles of H and D atoms from the reaction O(1D) + HD were measured under single-collision conditions, O(1D) atoms were generated by laser photolysis of N2O at 193 nm. With a calibration method using HCl photolysis as a source of well defined H atom concentrations the following absolute rate constants k and absolute reactive cross-sections σR have been determined: k = (1.3 ± 0.3) × 10-10 cm3s-1 molec-1 and σR(0.14 eV) = 4.0 ± 0.9 Å2 for the reaction channel O(1D) + HD → OD + H, and k = (1.0 ± 0.3) × 10-10 cm3 s-1 molec-1 and σR(0.14 eV) = (3.0 ± 0.7) Å2 for the reaction channel O(1D) + HD → OH + D. The isotopic branching ratio for the reaction O(1D) + HD was measured directly to be ΓH/D = 1.35 ± 0.20. In addition, from the measured H and D atom Doppler profiles the fraction f{hook}T of the available energy released as translational energy was determined for the individual product channels to be f{hook}T(OD + H) = 0.41 ± 0.07 and f{hook}T(OH + D) = 0.32 ± 0.05.
UR - http://www.scopus.com/inward/record.url?scp=0001361806&partnerID=8YFLogxK
U2 - 10.1016/0009-2614(95)00213-N
DO - 10.1016/0009-2614(95)00213-N
M3 - Article
AN - SCOPUS:0001361806
VL - 236
SP - 343
EP - 349
JO - Chemical Physics Letters
JF - Chemical Physics Letters
SN - 0009-2614
IS - 3
ER -