The fluorescence lifetime of xuleneda is found to be longer than that of azulenef?e both in frozen scluticn and under collision-free condition in the vapour. The lifetime of the emission of the isolated molecule decreases with higher energy excitation.
Position dependent deuterium effects on the vapor phase fluorescence lifetimes of dideutero phenanthrenes
โ Scribed by James J. O'Brien; Bryan R. Henry; Ben K. Selinger
- Publisher
- Elsevier Science
- Year
- 1977
- Tongue
- English
- Weight
- 409 KB
- Volume
- 46
- Category
- Article
- ISSN
- 0009-2614
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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.
Fluorescence-excitation and quantum-yield spectra were measured along the rotational contours of the O-O and lOa: bands of pyrazme and the O-O band of pyrimidme in the vapor phase at low pressure. A marked variation in quantum yield was observed. The yield spectra for the O-O bands exhiiit a very sh