The deuterium effect on the triplet radiative decay rate of aromatic molecules
โ Scribed by Philip M. Johnson; Mario C. Studer
- Publisher
- Elsevier Science
- Year
- 1973
- Tongue
- English
- Weight
- 435 KB
- Volume
- 18
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
of.reIative quantum yields of pkosphorescene have been made for naphthalene versus perdeuteranaphthalenc and for toluene versus perdeutcrotoluene, all contained in argon crystds at 20ยฐK. In combination with tripIet lifetime measurements these quantum yield ratios give the ratios of radiative tripfet decay rates. No radiative denterium effect is found for toluene and only a small effect is seen in naphthalene in contrast to the rather large radiative deuterium effect seen for naphthalene in EPA by Li and Lim.
๐ SIMILAR VOLUMES
The cffcct ofdcutcratlon in slowmg the radtationlesc decay of the triplet state of several porphyrin free bxxs is shown to depend critically on the position of deutcration. Deuteration of the N-II positions is one order of magnttude more effective per bond than dcuterdtlon of the rmg pocitions.
The radiative decay rates of the 3rr,\* states of coumarin, piperonal and 4-methoxybenzaldehyde were determined at the O-O, and different vibronic bands involving both totally and non-totally symmetric vibrations. The emission from the z and x sublevels is primarily due to the mixing of the 3nrr\*
Due to a significant discrepancy between theoretical calculations and euperimcntal exit&on data, the position of the low-lying triplet state df water has been much debated in recent years. WC now report that the corresponding transition (= 4.0 eV) can be observed also in emission upon charge neutral