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).
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| DOI (Digital Object Identifier) Link: | https://doi.org/10.1016/j.cplett.2017.06.051 |
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| Google Scholar: | Look up in Google Scholar |
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 |
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| 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) |
| Research Group: | Physics |
| Item ID: | 50481 |
| Depositing User: | Sam Eden |
| Date Deposited: | 15 Aug 2017 13:22 |
| Last Modified: | 24 Jun 2018 01:00 |
| URI: | http://oro.open.ac.uk/id/eprint/50481 |
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