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

Abstract

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

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

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