It is shown that the long-lived transient absorption which is observed when solutions of cryptocyanine and DDI (I, I'-diethyl-2,2'-dicarbocyanine iodide) in methanol und other alcohols are exposed to nanosecond ruby laser pulses arises from a photoproduct whose formation requires consecutive absorpt
Transient absorptions in a polymethine laser dye
β Scribed by Jean-Pierre Fouassier; Daniel-Joseph Lougnot; Jean Faure
- Publisher
- Elsevier Science
- Year
- 1975
- Tongue
- English
- Weight
- 581 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
Transient absorptions in RITC are investigated in the range 650-950 nm by a conventionel flash photolysis technique and "picosecond" spectroscopy with B train of 6 to 7 pulses. This study gives evidence for Sr-S, absorption, photoisomer and triplet generation. The comparison between experimental datz and computer solutions dlows the determination of the rate constants of these processes and molar extinction coefficients of the absorption spectra. T&q into account thee results, we discuss the limitations of the performances of the flashlamp escited HITC dye luer.
π SIMILAR VOLUMES
The transient absorption spectra, over the spectral range 430 to 1020 nm, are presented for pure Liquid pyrene at 42S'K. The absorption profiks show both short-and long-lived components. The long-lived transient has a lifetime much greater than the lifetime of the monitoring flash-lamp pulx, and it