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1+1 ' resonant multiphoton ionisation of OH radicals via the A(2)sigma(+) state: insights from direct comparison with A-X laser-induced fluorescence detection

Beames, Joseph ORCID: https://orcid.org/0000-0002-5508-8236, Liu, Fang and Lester, Marsha I. 2014. 1+1 ' resonant multiphoton ionisation of OH radicals via the A(2)sigma(+) state: insights from direct comparison with A-X laser-induced fluorescence detection. Molecular Physics 112 (7) , pp. 897-903. 10.1080/00268976.2013.822592

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Abstract

A 1+1′ resonance-enhanced multiphoton ionisation (REMPI) scheme for OH X2Π radicals is characterised for a broad range of intermediate A2Σ+ (v = 1, J, Fi) levels. The intensities of OH A-X (1,0) transitions detected by subsequent fixed-frequency VUV ionisation are compared with those obtained by near simultaneous laser-induced fluorescence (LIF) measurements. The ratios of the 1+1′ REMPI to LIF signals are used to derive enhancement factors which reflect the VUV absorption to the OH A3Π, 3d, v = 0 Rydberg state and/or the fast autoionisation process that yields OH+ ions. The determination of the enhancement factors permits 1+1′ REMPI to be utilised as a quantitative state-specific probe of OH X2Π radicals.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Subjects: Q Science > QD Chemistry
Publisher: Taylor & Francis
Last Modified: 28 Oct 2022 08:58
URI: https://orca.cardiff.ac.uk/id/eprint/72853

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