Abstract
The fluorescence decay of adenosine in 1:1 glycol/water glass has been determined at 77K using narrow pulse (700 ps) laser excitation at 290 nm and fluorescence detection with a scanned narrow-gate (100 ps) fast sampler together with digital averaging. Data analysis by re-iterative non-linear least squares convolution shows the decay is best represented by the bi-exponential form I(t) = 0.59exp − t 1.2ns + 0.41 exp − t 7.0ns . This leads to intrinsic radiative lifetimes of 150 ns and 220 ns respectively and a combined oscillator strength of 1.5 × 10 −2. Compared with the overall oscillator strength of 0.29 for the entire first absorption band of adenosine this indicates that transitions to and from the lowest-lying state in this band are quite forbidden. This is not accounted for by current theoretical considerations.
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