| Abstract: |
| 1. |
For dyes the steric hindrance that is ereated when several hydrogen atoms are replaced by fluorine leads to a decrease of
1.5-2 times in the activation energy for the relaxation of the photoisomers and a decrease in the life span of the photoisomers
by 3–4 orders of magnitude when compared with the unhindered photoisomers of the dyes. Despite the great steric hindrance,
the radiationless degradation of the energy goes for the dyes by the path of cis—trans isomerization.
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| 2. |
Isomerization from the triplet states of the dyes causes a rapid deactivation of the triplets in the ground state of the photoisomer.
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| 3. |
Due to the high coefficient of converting the radiation and the photochemical stabilitys, 3,3'-diethyl-9-fluor othiacarbocyanine
can be used successfully as an active medium for lasers.
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