Quantum state distribution of the OH X²Π products from collisional quenching of OH A²Σ+ by O₂ and CO₂

Dempsey, L.P., Sechler, T.D., Murray, C. and Lester, M.I. (2009) Quantum state distribution of the OH X²Π products from collisional quenching of OH A²Σ+ by O₂ and CO₂. Journal of Physical Chemistry A, 113(25), pp. 6851-6858. (doi: 10.1021/jp902935c)

Abstract

The OH X²Π product state distribution arising from quenching of electronically excited OH A²Σ+ by O₂ and CO₂ under single collision conditions has been determined using a pump−probe technique. For both collision partners, the majority of OH X²Π products are observed in their lowest vibrational level, v′′ = 0, with significantly less population in v′′ = 1. The OH products from quenching by O₂ are generated with a substantial degree of rotational excitation, peaking around N′′ ≈ 17, with an average rotational energy of 4800 cm⁻¹, whereas OH products from quenching by CO₂ exhibit a moderate degree of rotational excitation, peaking around N′′ ≈ 5, with an average rotational energy of 1800 cm⁻¹. The branching fraction into OH X²Π products states reveals that nonreactive quenching is a significant decay pathway for both systems, accounting for at least 40(1)% of the quenched products with O₂ and 64(5)% with CO₂

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Murray, Dr Craig
• Authors: Dempsey, L.P., Sechler, T.D., Murray, C., and Lester, M.I.
• Subjects: Q Science > QD Chemistry
• College/School: College of Science and Engineering > School of Chemistry
• Journal Name: Journal of Physical Chemistry A
• ISSN: 1089-5639
• ISSN (Online): 1520-5215