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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).
DOI: https://doi.org/10.1016/j.cplett.2017.06.051
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.
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About
- Item ORO ID
- 50481
- Item Type
- Journal Item
- ISSN
- 0009-2614
- Keywords
- Thymine; Uracil; pyrimidine nucleobases; metastable fragmentation; multi-photon ionization; mass spectrometry
- Academic Unit or School
-
Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM) - Research Group
- Physics
- Copyright Holders
- © 2017 Elsevier B.V.
- Depositing User
- Sam Eden