1979
DOI: 10.1063/1.438081
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Vapor-phase fluorescence emissions of pyridine and its methyl derivatives: Excitation-energy dependence of nonradiative electronic relaxation

Abstract: Vapor-phase fluorescence from the S1 (n, π*) states of pyridine-h5 and -d5, α- and β-picolines, and 2,6-lutidine has been studied. The fluorescence quantum yields of these compounds are, respectively, 5.9×10−5, 6.0×10−5, 3.5×10−5, 5.4×10−5, and 2.5×10−5 for excitation to the zero-point level of S1. The quantum yields of the first four compounds decrease sharply as the excitation energy is raised to the value corresponding to the S2 (π, π*) state, whereas the yield of 2,6-lutidine is fairly constant throughout … Show more

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Cited by 72 publications
(59 citation statements)
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“…This is supported by fluorescence lifetime measurements of pyridine vapor in a low pressure static cell, which are independent of the addition of SF 6 up to 100 Torr and show a strong dependence on the vibronic excitation. 5 Furthermore, the relaxation dynamics of S 1 pyridine has been studied in a pulsed laser, supersonic jet experiment by monitoring, as a function of the excess energy with respect to the S 1 zero point level ͑ZPL͒, both LIF and the formation of the triplet state. 8 Quantum yields of fluorescence and ISC of single vibronic levels were thereby determined.…”
Section: Introductionmentioning
confidence: 99%
“…This is supported by fluorescence lifetime measurements of pyridine vapor in a low pressure static cell, which are independent of the addition of SF 6 up to 100 Torr and show a strong dependence on the vibronic excitation. 5 Furthermore, the relaxation dynamics of S 1 pyridine has been studied in a pulsed laser, supersonic jet experiment by monitoring, as a function of the excess energy with respect to the S 1 zero point level ͑ZPL͒, both LIF and the formation of the triplet state. 8 Quantum yields of fluorescence and ISC of single vibronic levels were thereby determined.…”
Section: Introductionmentioning
confidence: 99%
“…17,23,32 Intersystem crossing (ISC) throughout the manifold of singlet and triplet states of both π * ← π and π * ← n character is also rapid in accordance with El-Sayed's rules. 17,30,33 Furthermore, additional complications arise due to the overlap of the two lowest π * ← n states (S 1 and S 3 ) and the S 2 π * ← π electronic band, congesting the absorption spectra.…”
Section: 15mentioning
confidence: 99%
“…The rapid and efficient deactivation manifests in fluorescence quenching, 8,[29][30][31] short excited state lifetimes and lifetime-broadened absorption profiles. 17,23,32 Intersystem crossing (ISC) throughout the manifold of singlet and triplet states of both π * ← π and π * ← n character is also rapid in accordance with El-Sayed's rules.…”
Section: 15mentioning
confidence: 99%
“…The lowest singlet excited state, S 1 , of pyridine has been assigned as 1 (n, p * ) in nature [2]. It was reported also that pyridine and methyl-substituted pyridines exhibit extremely weak emission in the vapor phase, which have been assigned as the 1 (n, p * ) fluorescence [3][4][5]. In order to obtain a deeper insight into the emission properties of pyridine, it must be of importance to investigate the emission properties of the derivatives of pyridine.…”
Section: Introductionmentioning
confidence: 97%