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  A free electron laser-based 1+1′ resonance-enhanced multiphoton ionization scheme for rotationally resolved detection of OH radicals with correct relative intensities

Quan, J., Chang, Y., Li, Z., Zhao, Y., Luo, Z., Wu, Y., et al. (2021). A free electron laser-based 1+1′ resonance-enhanced multiphoton ionization scheme for rotationally resolved detection of OH radicals with correct relative intensities. Journal of Molecular Spectroscopy, 380: 111509. doi:10.1016/j.jms.2021.111509.

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Quan, J.1, Author              
Chang, Y., Author
Li, Z., Author
Zhao, Y., Author
Luo, Z., Author
Wu, Y., Author
Zhang, S., Author
Chen, Z., Author
Yang, J., Author
Yuan, K., Author
Yang, X., Author
Krüger, B. C.1, Author              
Schwarzer, D.1, Author              
Wodtke, A. M.2, Author              
Park, G. B.1, Author              
Affiliations:
1Department of Dynamics at Surfaces, MPI for Biophysical Chemistry, Max Planck Society, ou_578600              
2Department of Dynamics at Surfaces, MPI for biophysical chemistry, Max Planck Society, ou_578600              

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 Abstract: The key role played by the OH radical as a reactive intermediate motivates advanced methods for state-resolved OH detection. In this work, we take advantage of the wavelength- and bandwidth-tunable vacuum ultraviolet (VUV) pulses produced at the Dalian Coherent Light Source to modify a previously reported 1+1′ UV + VUV Resonance-Enhanced Multiphoton Ionization scheme [J. M. Beames, F. Liu, M. I. Lester, C. Murray, J. Chem. Phys. 134, 241,102 (2011); J. M. Beames, F. Liu, M. I. Lester, Mol. Phys. 112, 897 (2014)], in which OH in its ground electronic state is first excited to the state at around 281 nm, and subsequently ionized by 118 nm VUV radiation via the autoionizing () Rydberg state. By tuning the VUV-free electron laser so that its bandwidth covers the entire A3 + = 0, 3d) A2+ ″ = 1) band, we obtain enhanced sensitivity and accurate relative intensities for quantitative determination of quantum state distributions. The relative line intensities observed in the experiment agree with the simulated absorption intensities to within an error of <1% of the integrated band intensity. The 1+1′ scheme is also compared to a convenient one-color 2+1 scheme [M. Collard, P. Kerwin, A. Hodgson, Chem. Phys. Lett. 179, 422–428 (1991)], which suffers due to rapid predissociation of the D 2Σ− state used as resonant intermediate.

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Language(s): eng - English
 Dates: 2021-07-242021-08
 Publication Status: Published in print
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 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.jms.2021.111509
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Title: Journal of Molecular Spectroscopy
Source Genre: Journal
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Pages: 8 Volume / Issue: 380 Sequence Number: 111509 Start / End Page: - Identifier: -