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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., Eden, S. (2017) Threshold behavior in metastable dissociation of multi-photon ionized thymine and uracil. Chemical Physics Letters, 684 . pp. 233-238. ISSN 0009-2614. (doi:10.1016/j.cplett.2017.06.051) (KAR id:74655)

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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: Article
DOI/Identification number: 10.1016/j.cplett.2017.06.051
Uncontrolled keywords: Mass spectrometry, Metastable fragmentation, Multi-photon ionization, Pyrimidine nucleobases, Thymine, Uracil, Aromatic compounds, Ionization, Ionization of gases, Mass spectrometry, Photons, Metastable fragmentation, Multiphoton ionization, Nucleobases, Thymine, Uracil, Photoionization
Divisions: Faculties > Sciences > School of Physical Sciences
Depositing User: Nigel Mason
Date Deposited: 02 Jul 2019 10:09 UTC
Last Modified: 15 Jan 2020 14:31 UTC
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