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

R. Pandey, M. Ryszka, T. da Fonseca Cunha, M. Lalande, M. Dampc, P. Limão-Vieira, N. J. Mason, J. C. Poully, S. Eden

Research output: Contribution to journalArticle

6 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)233-238
Number of pages6
JournalChemical Physics Letters
Volume684
DOIs
Publication statusPublished - 1 Jan 2017

Keywords

  • Mass spectrometry
  • Metastable fragmentation
  • Multi-photon ionization
  • Pyrimidine nucleobases
  • Thymine
  • Uracil

Fingerprint Dive into the research topics of 'Threshold behavior in metastable dissociation of multi-photon ionized thymine and uracil'. Together they form a unique fingerprint.

  • Cite this

    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, 233-238. https://doi.org/10.1016/j.cplett.2017.06.051