A Novel Fiber-Optic-Based Pump-Probe Instrument for the Acquisition of Kinetic Information

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A pump-probe instrument is described that utilizes two beams from the same laser and a fiber-optic-based sample cell for low-temperature measurements. The utility of this instrument is demonstrated through an examination of the excited-state kinetics of 2,7-diphenylphenanthrene, for which the rate constant of singlet-to-triplet intersystem crossing is found to be approximately 8 × 105 S−1. This molecule is interesting in that it undergoes an unusual rotational conformation change in the triplet state with a rate constant of 2.4 × 108 S−1 at 77 K.

Keywords: 2,7-diphenylphenanthrene; Instrumentation, fiber optics; Intersystem crossing; Pump-probe spectroscopy

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702924125465

Affiliations: 1: Department of Chemistry, Indiana University, Bloomington, Indiana 47405; current address: Department of Chemistry, University of Massachusetts, Amherst, MA 01003 2: Department of Chemistry, Indiana University, Bloomington, Indiana 47405

Publication date: February 1, 1992

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