The fluorescence ofbgr;hyphen;naphthylamine vapor in the lowhyphen;pressure region was timed directly using a highhyphen;speed laboratory light modulator. Emission was from defined, and variable quantum states initially pumped with highhyphen;intensity monochromatic light. The energy of irradiation was swept over a range of 10 000 cmminus;1, encompassing two excited electronic manifolds. The results then constitute a direct timed measurement of the relaxation from individual vibronic states as the energy of excitation is continuously increased. This is then a spectrum of vibronic lifetimes which is discussed in terms of various theories for electronic relaxation.
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