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Threshold behavior in metastable dissociation of multi-photon ionized thymine and uracil

Pandey, R.; Ryszka, M.; da Fonseca Cunha, T.; Lalande, M.; Dampc, M.; Limão-Vieira, P.; Mason, N.J.; Poully, J.C. and Eden, S. (2017). Threshold behavior in metastable dissociation of multi-photon ionized thymine and uracil. Chemical Physics Letters, 684 pp. 233–238.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1016/j.cplett.2017.06.051
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Abstract

Microsecond-timescale HNCO loss has been observed from single-color multi-photon ionized pyrimidine nucleobases in the gas phase. Photon energy thresholds for the metastable channels have been measured at 5.55 ± 0.02 eV for thymine and 5.57 ± 0.02 eV for uracil. We argue that these results can be attributed to accessing the molecules’ S1 states with additional vibrational energy matching the threshold energy for HNCO loss from the radical cation. Combined with previous photoionization energies, this enables the S1 adiabatic energies to be deduced: 3.67 ± 0.07 eV for thymine and 3.77 ± 0.07 eV for uracil. These values are consistent with recent calculations.

Item Type: Journal Item
Copyright Holders: 2017 Elsevier B.V.
ISSN: 0009-2614
Keywords: Thymine; Uracil; pyrimidine nucleobases; metastable fragmentation; multi-photon ionization; mass spectrometry
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 50481
Depositing User: Sam Eden
Date Deposited: 15 Aug 2017 13:22
Last Modified: 15 Aug 2017 13:22
URI: http://oro.open.ac.uk/id/eprint/50481
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