Reports

Mode-Locked Lasers: Measurements of Very Fast Radiative Decay in Fluorescent Systems

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Science  18 Apr 1969:
Vol. 164, Issue 3877, pp. 301-302
DOI: 10.1126/science.164.3877.301

Abstract

A mnode-locked laser was used to measure fluorescence decay down to 80 picoseconds. Measurements on the fluorescence of methylene blue quenchled with potassium iodide demonstrate the effectiveness of the method. Fluorescence decay times of chlorophyll b (3.87 ± 0.05 nianoseconds) and c-phycocyanin (1.14 ± 0.01 nanoseconds) in vitro and chlorophyll a in the green alga Chlorella pyrenoidosa (1.14 to 1.6 nanoseconds) compare well with some of the existing data.