Instrument to Measure Fluorescence Lifetimes in the Millimicrosecond Region

Abstract

An instrument to measure fluorescence lifetimes of the order of millimicroseconds is described. Following excitation by a hydrogen flash lamp, the fluorescence is observed stroboscopically with a gated photomultiplier. The method of gating is novel and achieves a time resolution comparable with fast oscilloscopes (1.8×10−9 sec). The data are presented in the form of a chart record.