Fluorescence excitation spectra of indole, 3-methyl indole, and 3-indole acetic acid in supersonic jets

Richard Bersohn*, Uzi Even, Joshua Jortner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

83 Scopus citations

Abstract

In this paper we report on the laser-induced fluorescence spectra of indole, 3-methyl indole, and 3-indole acetic acid in pulsed supersonic expansions of He. The electronic origin of the first excited (1L b) state is 35 233 cm-1 for indole, 34 887 cm-1 for 3-methyl indole, and 34 044 cm-1 for 3-indole acetic acid. On the basis of the energetics and fluorescence lifetimes, the spectral features at excess vibrational energies Eν=0-2200 cm-1 for indole and Eν=0-1600 cm-1 for 3-methyl indole were assigned to the vibrational level structure within a single electronic manifold. The second electronically excited (1La) state is not located in the above energy ranges. The energetics of selective solvation of 3-methyl indole was inferred from the spectra of the van der Waals complexes with Ar, H 2O, and D2O, which provide information on microscopic solvent shifts of the electronic origin and of some prominent vibrational excitations of the 1Lb states.

Original languageEnglish
Pages (from-to)1050-1058
Number of pages9
JournalThe Journal of Chemical Physics
Volume80
Issue number3
DOIs
StatePublished - 1983

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