The time-resolved thermal lens technique is used to measure quantum yields of triplet formation and triplet lifetime in the solid phase at low temperature. The time dependence of the thermal lens signal of pyridazine in the solid phase is very different from that in a fluid medium. These results are
Measurement of the triplet lifetime and the quantum yield of triplet formation of phthalazine by the time-resolved thermal lens method
β Scribed by Masahide Terazima; Tohru Azumi
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- English
- Weight
- 367 KB
- Volume
- 141
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
The time-resolved thermal lens technique is used to determine the quantum yield of the triplet formation and the triplet lifetime of phthalazine in a polar and a non-polar solvent. The quantum yields of phthalazine in ethanol and benzene are 0.44 and 0.49, respectively. Very short triplet lifetimes of phthalazine (2.7 ps) in benzene at room temperature are reported.
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Triplet-triplet absorption is sensitively detected by the time-resolved two-step excitation thermal grating method. This method provides zero-background detection of the transient absorption. As an example of the application, measurement of the quantum yield of energy transfer from the higher excite
The energetics and lifetimes of a number of substituted oletin and diene triplets have been measured using photoacoustic calorimetry. All the acyclic triplets studied have triplet energies less than their spectroscopic values. This suggests they prefer a twisted relaxed geometry.