Abstract
AbstractAromatic molecules are excited into vibronic levels of the first excited singlet state by irradiation with light of narrow bandwidth (2–4 Å). If the vapor pressure is low enough (≤ 0,1 Torr) resonance fluorescence is observed which originates from the primarily excited vibronic levels. Resonance fluorescence could be detected in the case of toluene, p, m, and o‐xylene, naphthalene and aniline. Most of the vibrational bands could be assigned. In opposition to the results obtained with benzene it is found that vibrational bands which are correlated with higher vibronic levels are superimposed on a non‐resolved background of high intensity. It is pointed to a correlation between the vibrational structure of the absorption spectra and the related resonance spectra.
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