Pyrazine fluorescence time dependence

Theoretical papers on effects directly observable in the very short time regime are notable in this years collection. The theory of femtosecond pump-probe spectroscopy of ultrafast Internal conversion processes in polyatomic molecules has been developed using the behaviour of the excited pyrazine molecule as an example . The solvation dynamics for an ion pair in a polar solvent can now be examined by the time dependence of fluorescence and by direct observation of photoinduced charge... 

IV. The Time Dependence of the Fluorescence of the Rotationless Excited Singlet State of Pyrazine... 

IV. THE TIME DEPENDENCE OF THE FLUORESCENCE OF THE ROTATIONLESS EXCITED SINGLET STATE OF PYRAZINE... 

As we outlined in the theoretical section, the time dependence of the fluorescence is critically dependent on the type of exciting source used. We therefore list the experiments as a function of increasing laser width. We will first limit ourselves to the photodynamics of the J = 0, K = 0 rotational state of the lB3u of pyrazine, since only of that state we know the ME spectrum. 

Clearly, much activity may be expected in the specific area of rotational coherence and the more general one of time-resolved and polarization-analyzed fluorescence. One area of interest, not touched upon here, concerns the influence of rotational coherence in electronic relaxation processes. In this we regard it is pertinent to note the polarization-dependent decays reported first by Matsumoto et al.72 in their studies on the nanosecond time scale of singlet-triplet coupling in pyrazine. 

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