The influence of substituent position on the excited state dynamics operating in 4-, 5- and 6-hydroxyindole

Stuart W. Crane, Omair Ghafur, Lisa Saalbach, Martin J. Paterson, Dave Townsend

Research output: Contribution to journalArticle

Abstract

Ultrafast time-resolved ion yield spectroscopy using 286 nm excitation reveals more than an order of magnitude difference between the S 1(ππ*) excited state lifetimes of several monohydroxyindole (HI) species (4-HI < 6-HI < 5-HI). The observed trend is even more striking upon considering the degree of excitation relative to the S 1(ππ*) origin – something investigated further by supporting coupled-cluster quantum chemistry calculations. The work was facilitated by the use of a simple laser-based desorption method that offers an alternative strategy to molecular beam methods when conducting gas-phase experiments with low vapor pressure samples.

Original languageEnglish
Article number136870
JournalChemical Physics Letters
Volume738
Early online date19 Oct 2019
DOIs
Publication statusPublished - Jan 2020

Keywords

  • Coupled-cluster methods
  • Excited state dynamics
  • Laser-based thermal desorption
  • Mixed Rydberg/valence states
  • Ultrafast spectroscopy

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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