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Measurements of sub-nanosecond lifetimes by means of nanosecond laser pulses

โœ Scribed by K. Razi Naqvi; D.K. Sharma; G.J. Hoytink

Publisher
Elsevier Science
Year
1973
Tongue
English
Weight
387 KB
Volume
22
Category
Article
ISSN
0009-2614

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โœฆ Synopsis

It is shown that the lifetimes of excited states of molecules which give a reasonably strong absorption (molar decndic estinction coefficient E > 1G4 hi-' cm-') at the frequency of the ruby laser can be determined from the UCUration of the optical transitions. This is illustrated for DDI (1, I'-diethyI-2,2'-dicarbocyaninc iodide) in glycrro1, which appears to have a lowest excited state with a lifetime of 110 psec. Thisvalue agrees fairly well with that c&ulnted from the formula for the rate of internal conversion derived from Siebrand's work. Under favourable conditions lifetimes as short as 10 psec can be measured.

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