Author： Dubovskii V. Mikhal’chuk A. Raichenok T. Sobchuk A. Sukhodola A. Tolstorozhev G.
Publisher： Springer Publishing Company
ISSN： 0021-9037
Source： Journal of Applied Spectroscopy, Vol.73, Iss.3, 2006-05, pp. : 347-352
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Abstract
We have used steady-state fluorescence spectroscopy and pulsed kinetic fluorimetry with high time resolution to experimentally study the spectral and temporal characteristics of luminescence of immunoactive 8-aza-D-homogona-1,3,5(10), 13-tetraene-12,17a-dione (8-aza-D-homogonane) molecules in the gas phase. We have established the existence of several centers emitting long-wavelength and short-wavelength fluorescence. The fluorescence of high-temperature 8-aza-D-homogonane vapor (T = 550 K) when excited by radiation with λex = 266 nm is represented by two spectrally separated emission bands with maxima λ maxfl = 465 nm and λ maxfl = 365 nm. Analysis of the distribution of fluorescence decay times for 8-aza-D-homogonane showed that in the spectral range of the emission wavelengths 360–590 nm, the fluorescence decay kinetics contains three components with average lifetimes <200 psec, 2.8 nsec and 13.5 nsec. The multicenter nature of luminescence of 8-aza-D-homogonane was confirmed by direct measurements of instantaneous fluorescence spectra in different stages of luminescence decay.
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