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

doi:10.1016/j.cplett.2017.06.051

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 journal › Article

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 language	English
Pages (from-to)	233-238
Number of pages	6
Journal	Chemical Physics Letters
Volume	684
DOIs	https://doi.org/10.1016/j.cplett.2017.06.051
Publication status	Published - 1 Jan 2017

Keywords

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

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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., & 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

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title = "Threshold behavior in metastable dissociation of multi-photon ionized thymine and uracil",

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{\textquoteright} 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.",

keywords = "Mass spectrometry, Metastable fragmentation, Multi-photon ionization, Pyrimidine nucleobases, Thymine, Uracil",

author = "R. Pandey and M. Ryszka and {da Fonseca Cunha}, T. and M. Lalande and M. Dampc and P. Lim{\~a}o-Vieira and Mason, {N. J.} and Poully, {J. C.} and S. Eden",

note = "sem pdf conforme despacho. British EPSRC through a Life Sciences Interface Fellowship (EP/E039618/1), a Career Acceleration Fellowship (EP/J002577/1), and a Research Grant (EP/L002191/1). The European Commission is acknowledged for a Marie Curie Intra-European Reintegration Grant (MERG-CT-2007-207292). SE and J-CP are grateful to the steering committee of the EU/ESF COST Action XLIC (CM1204) for funding a Short-Term Scientific Mission in December 2014. The CNRS is acknowledged for a PICS grant (07390) supporting the collaboration between CIMAP/GANIL and the OU. PLV acknowledges the Portuguese National Funding agency FCT-MCTES for grant UID/FIS/00068/2013. TC acknowledges FCT-MCTES for a scholarship (SFRH/BD/52538/2014). This work was also supported by the Radiation Biology and Biophysics Doctoral Training Programme (RaBBiT, PD/00193/2010); UID/Multi/ 04378/2013 (UCIBIO). ",

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doi = "10.1016/j.cplett.2017.06.051",

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T1 - Threshold behavior in metastable dissociation of multi-photon ionized thymine and uracil

AU - Pandey, R.

AU - Ryszka, M.

AU - da Fonseca Cunha, T.

AU - Lalande, M.

AU - Dampc, M.

AU - Limão-Vieira, P.

AU - Mason, N. J.

AU - Poully, J. C.

AU - Eden, S.

N1 - sem pdf conforme despacho. British EPSRC through a Life Sciences Interface Fellowship (EP/E039618/1), a Career Acceleration Fellowship (EP/J002577/1), and a Research Grant (EP/L002191/1). The European Commission is acknowledged for a Marie Curie Intra-European Reintegration Grant (MERG-CT-2007-207292). SE and J-CP are grateful to the steering committee of the EU/ESF COST Action XLIC (CM1204) for funding a Short-Term Scientific Mission in December 2014. The CNRS is acknowledged for a PICS grant (07390) supporting the collaboration between CIMAP/GANIL and the OU. PLV acknowledges the Portuguese National Funding agency FCT-MCTES for grant UID/FIS/00068/2013. TC acknowledges FCT-MCTES for a scholarship (SFRH/BD/52538/2014). This work was also supported by the Radiation Biology and Biophysics Doctoral Training Programme (RaBBiT, PD/00193/2010); UID/Multi/ 04378/2013 (UCIBIO).

PY - 2017/1/1

Y1 - 2017/1/1

N2 - 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.

AB - 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.

KW - Mass spectrometry

KW - Metastable fragmentation

KW - Multi-photon ionization

KW - Pyrimidine nucleobases

KW - Thymine

KW - Uracil

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DO - 10.1016/j.cplett.2017.06.051

M3 - Article

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VL - 684

SP - 233

EP - 238

JO - Chemical Physics Letters

JF - Chemical Physics Letters

SN - 0009-2614

ER -