Summary
The fluorescence of C6H6, C6H5F, 1,4-C6H4F2 and C6F6 excited by a KrF laser has been observed in the gas phase. The collisionless lifetime of C6H6(Ã1B2u) with 2000 to 3000 cm−1 of vibrational energy is 28 ns, which is a factor of two less than earlier results. Selfquenching of benzene leads to redistribution of vibrational energy in theS 1 state. C6F6 yields CF2 when irradiated by the laser.
Riassunto
Si è osservata nella fase di gas la fluorescenza di C6H6, C6H5F, 1,4-C6H4F2 e C6F6 eccitati da un laser a KrF. La vita media senza collisione di C6H6 (Ã1 B 2u) con un’energia vibrazionale da 2000 a 3000 cm−1 è 28 ns, cioè due volte più piccola che nei precedenti risultati. L’autospegnimento del benzene porta alla ridistribuzione dell’energia vibrazionale nello statoS 1. C6F6 dà CF2 quando è irradiato col laser.
Резюме
В газовои фазе наблюдается флуоресценция C6H6, C6H5F, 1,4-C6H4F2 и C6F6, возбужденных KrF-лазером. Ъесстолкновительное время жизни C6H6(Ã1 B 2u) при значениях вибрационной энергии от 2000 до 3000 см−1 составляет 28 нс, что в два раза меныше предыдущих результатов. Самогашение бензола приводит к перераспределению вибрационной энергии вS 1 состоянии. C6F6 превращается в CF2 при облучении лазером.
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Hack, W., Langel, W. KrF-laser-induced fluorescence of benzene and its fluorinated derivatives in the gas phase. Nuov Cim B 63, 207–220 (1981). https://doi.org/10.1007/BF02721426
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DOI: https://doi.org/10.1007/BF02721426