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Ultrafast relaxation in the fluorescent state of the laser dye DCM

✍ Scribed by David C. Easter; A.P. Baronavski

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 475 KB
Volume: 201
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(93)85049-t

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✦ Synopsis

Ultrafast relaxation in the fluorescent state of 4-(dicyanomethylene)-2-methyl-6-(pdimethylaminostyry1)-4H-pyran (DCM) has been interrogated by time-resolved femtosecond absorption spectroscopy both in methanol and in ethylene glycol. Following a subpicosecond rise, each frequency-specific trace in ethylene glycol exhibits either a slower increase or a slower decrease in transmission; an additional long-term &cay is seen in methanol solution. The data are generally consistent with recent solvation dynamics studies that employed different probe molecules, but the solvation time we measure for ethylene glycol is an order of magnitude shorter than previously reported.

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