Beames, J.M., Liu, F., Lester, M.I. and Murray, C. (2011) A new spectroscopic window on hydroxyl radicals using UV + VUV resonant ionization. Journal of Chemical Physics, 134(24), p. 241102. (doi: 10.1063/1.3608061)
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Publisher's URL: http://dx.doi.org/10.1063/1.3608061
Abstract
A 1 + 1′ multiphoton ionization (MPI) detection scheme for OH radicals is presented. The spectroscopic approach combines initial excitation on the well-characterized A<sup>2</sup>Σ+–X<sup>2</sup>Π band system with vacuum ultraviolet (VUV) ionization via autoionizing Rydberg states that converge on the OH<sup>+</sup> A<sup>3</sup>Π 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<sup>+</sup> ions. The onset of ionization with the (1,0) band is attributed to an energetic threshold; the combined UV + VUV photon energies are above the first member of the autoionizing (A<sup>3</sup>Π)nd Rydberg series. Comparison of the OH 1 + 1′ MPI signal with that from single photon VUV ionization of NO indicates that the cross section for photoionization from OH A<sup>2</sup>Σ+, v′ = 1 is on the order of 10<sup>−17</sup> cm<sup>2</sup>.
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Murray, Dr Craig |
Authors: | Beames, J.M., Liu, F., Lester, M.I., and Murray, C. |
Subjects: | Q Science > QD Chemistry |
College/School: | College of Science and Engineering > School of Chemistry |
Journal Name: | Journal of Chemical Physics |
ISSN: | 0021-9606 |
ISSN (Online): | 1089-7690 |
Published Online: | 24 June 2011 |
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