Communication: A new spectroscopic window on hydroxyl radicals using UV plus VUV resonant ionization

Beames, Joseph ORCID: https://orcid.org/0000-0002-5508-8236, Liu, Fan, Lester, Marsha I. and Murray, Craig 2011. Communication: A new spectroscopic window on hydroxyl radicals using UV plus VUV resonant ionization. Journal of Chemical Physics 134 (24) , 241102. 10.1063/1.3608061

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Abstract

A 1 + 1′multiphoton ionization (MPI) detection scheme for OH radicals is presented. The spectroscopic approach combines initial excitation on the well-characterized A2Σ+–X2Π band system with vacuum ultraviolet (VUV)ionization via autoionizing Rydberg states that converge on the OH+ A3Π ion state. Jet-cooled MPI spectra on the (1,0) and (2,0) bands show anomalous rotational line intensities, while initial excitation on the (0,0) band does not lead to detectable OH+ ions. The onset of ionization with the (1,0) band is attributed to an energetic threshold; the combined UV + VUVphoton energies are above the first member of the autoionizing (A3Π)nd Rydberg series. Comparison of the OH 1 + 1′ MPI signal with that from single photonVUVionization of NO indicates that the cross section for photoionization from OH A2Σ+, v ′ = 1 is on the order of 10−17 cm2.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry
Subjects:	Q Science > QD Chemistry
Publisher:	American Institute of Physics
ISSN:	0021-9606
Last Modified:	10 Dec 2022 02:22
URI:	https://orca.cardiff.ac.uk/id/eprint/72861

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