An apparatus is described which can detect transient absorptions in the nanosecond-microsecond time domain in opaque scattering materials by analysing diffusely reflected monitoring light following nanosecond laser excitation. For microcrystalline benzophenone excited by a 20 ns pulse at 354 nm, a t
Determination of triplet quantum yields by laser flash absorption spectroscopy
β Scribed by B. Amand; R. Bensasson
- Publisher
- Elsevier Science
- Year
- 1975
- Tongue
- English
- Weight
- 432 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
A general method based an a relative actinometry using the laser flash spectroscopy technique has been developed for the determination of the quantum yield of trip!et state formation $T. &l-values for 17 aromatic compounds in cyclohexane or benzene at room temperature have been obtained in good agreement with previous meaarements.
Triplet-triplet extinction coefficients necessary for the 0~ calculations and determined via enerm transfer are also reported. Conditions of application and limitations or this method are outlined.
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Quantum yields for the loss of disilane and the formation of silane in the 193 nm photodissociation of disilane have been measured using time-resolved infrared diode laser absorption spectroscopy under single excimer laser pulse conditions at total pressures of 5 to 10 Torr in helium buffer gas. The
## Lβ’mol -1 β’s -1 in benzene. The bimolecular rate constants of energy transfer from triplet excited 2-acetonaphthone to carotenoids were determined from the linear regression of the decay rate constant of 2-acetonaphthone triplet at varying carotenoid concentrations. The triplet lifetimes of 3 AS
The time-resolved quasi-cw form of intracavity laser spectroscopy is used for the quantitative determination of absolute intensities and self-broadening coefficients of weak vibration-rotation lines of water that absorb in the region of the \(720-\mathrm{nm}\) band. The studies have been conducted u