Absolute rate constants, reactive cross-sections and isotopic branching ratio for the reaction of O(1D) with HD

T. Laurent; P. D. Naik; H. R. Volpp; J. Wolfrum; T. Arusi-Parpar; I. Bar; S. Rosenwaks

doi:10.1016/0009-2614(95)00213-N

Absolute rate constants, reactive cross-sections and isotopic branching ratio for the reaction of O(¹D) with HD

T. Laurent, P. D. Naik, H. R. Volpp, J. Wolfrum, T. Arusi-Parpar, I. Bar, S. Rosenwaks

Department of Physics

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Abstract

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 σ_R have been determined: k = (1.3 ± 0.3) × 10^-10 cm³s^-1 molec^-1 and σ_R(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 σ_R(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 Γ_H/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.

Original language	English
Pages (from-to)	343-349
Number of pages	7
Journal	Chemical Physics Letters
Volume	236
Issue number	3
DOIs	https://doi.org/10.1016/0009-2614(95)00213-N
State	Published - 13 Apr 1995

ASJC Scopus subject areas

General Physics and Astronomy
Physical and Theoretical Chemistry

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10.1016/0009-2614(95)00213-N

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@article{0041b4097dc0468abf1d353360a1b25c,

title = "Absolute rate constants, reactive cross-sections and isotopic branching ratio for the reaction of O(1D) with HD",

abstract = "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 {\AA}2 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) {\AA}2 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.",

author = "T. Laurent and Naik, {P. D.} and Volpp, {H. R.} and J. Wolfrum and T. Arusi-Parpar and I. Bar and S. Rosenwaks",

note = "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.",

year = "1995",

month = apr,

day = "13",

doi = "10.1016/0009-2614(95)00213-N",

language = "English",

volume = "236",

pages = "343--349",

journal = "Chemical Physics Letters",

issn = "0009-2614",

publisher = "Elsevier B.V.",

number = "3",

}

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

SN - 0009-2614

VL - 236

SP - 343

EP - 349

JO - Chemical Physics Letters

JF - Chemical Physics Letters

IS - 3

ER -

Absolute rate constants, reactive cross-sections and isotopic branching ratio for the reaction of O(¹D) with HD

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