sistent with A-type Franck-Condon scattering. We conclude that the process which underlies the resonantly enhanced intensity of the C=C stretching mode of the monomer and dimer is quite different. ConclusionsThe profile for the resonance-enhanced intensity of marker bands of the Raman spectrum of chlorophyll a in hexane is interpreted in terms of the chemical structure of an approximately T-shaped dimer of this large molecule. The Raman data are consistent with a chemical linkage between the C=0 group on position 9 of ring V of one molecule to the Mg atom of another. The assignment of the resonance Raman spectrum in terms of this particular linkage is facilitated by the fact that the intensity of a C=0 mode associated with the ester group on position 10

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Fluorescent dyes derived from anilino-pyridinium are studied with respect to their application as probes of voltage-transients in neuron membranes. Their photophysical properties are characterized in bulk solvents. The spectral features of their voltage-sensitivity in membranes are determined. A mechanistic scheme of voltage-sensitivity is proposed. The dyes are applied for optical recording in neurites of cultivated neurons of the leech. The relative sensitivity is evaluated from the fluorescence transients induced by hyperpolarization on the basis of the cable equation. The pervasion of a neuritic tree by action potentials is observed.

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