ReceIvcd 6 Aprd 1982 QuanIum beats and fluorescence decays oT the viirmonlsss Sr s1m ofpioolcd pymmc hare been studled JS a iunclion oimagnelic field. Founer analysa of the modulated portions ol' these dccsys has yIelded results which arc cons~stcnt wIIh Rsc and secondarder Zeemzr effects occurrmg m
Rotational effects on fluorescence quantum yields of pyrazine and pyrimidine in the vapor phase
β Scribed by Hiroaki Baba; Masahisa Fujita; Katsuo Uchida
- Publisher
- Elsevier Science
- Year
- 1980
- Tongue
- English
- Weight
- 333 KB
- Volume
- 73
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
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 sharp peak near the band origin_ It is sumsted that the S-T coupling is enhanced with increasing rotation.
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The fluorescence quantum yields of the 7-aminocoumti dyes coumarin 1,102,X3, LD490, and CSF were measured using argon, air, and osygen as cover gases. The results show that, in ethanol, oxygen does quench these dyes and that the fluorescence is signiiicantly improved in some coumarin dyes by the rem