The branching of nonradiative processes in isoquinoline

Ofer Sneh*, Aviv Amirav, Ori Cheshnovsky

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We have measured the absolute rates of internal conversion and of intersystem crossing in isoquinoline excited to its S2 vibronic states (3131-3062 Å) in supersonic beams. The combination of direct detection of the triplets, absorption and excitation spectra allowed us to extract these rates. The intersystem crossing rate barely depends on the excess vibrational energy in the S2 manifold, being about 2×10 9s-1. The internal conversion rates grow by more than two orders of magnitude over the range of 0-800 cm-1 of excess vibrational energy in the S2 state, up to 5×10 10s-1. At the S2 electronic origin intersystem crossing is the dominant nonradiative channel, while at vibrational energy exceeding 400 cm-1 internal conversion becomes dominant.

Original languageEnglish
Pages (from-to)3532-3538
Number of pages7
JournalThe Journal of Chemical Physics
Volume91
Issue number6
DOIs
StatePublished - 1989

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