Torsional motion of the chromophore catechol following the absorption of ultraviolet light

J. D. Young, M. Staniforth, M. J. Paterson, V. G. Stavros

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Abstract

The ability to probe energy flow in molecules, following the absorption of ultraviolet light, is crucial to unraveling photophysical phenomena. Here we excite a coherent superposition of vibrational states in the first excited electronic state (S-1) in catechol, resulting in a vibrational wave packet. The observed quantum beats, assigned to superpositions of the low-frequency, and strongly mixed, O-H torsional mode tau(2), elegantly demonstrate how changes in geometry upon photoionization from the S-1 state to the ground state of the cation (D-0) enables one to probe energy flow at the very early stages of photoexcitation in this biological chromophore.

Original languageEnglish
Article number233001
Number of pages5
JournalPhysical Review Letters
Volume114
Issue number23
Early online date8 Jun 2015
DOIs
Publication statusPublished - 12 Jun 2015

Keywords

  • MULTIREFERENCE PERTURBATION-THEORY
  • EXCITED-STATES
  • S-1 STATE
  • DYNAMICS
  • VIBRATIONS
  • OLIGONUCLEOTIDES
  • PHOTOCHEMISTRY
  • SPECTROSCOPY
  • EUMELANIN
  • MOLECULES

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