Spectral resolution of long term (0.5-50 s) delayed fluorescence from spinach chloroplasts.

The emission spectrum of room temperature delayed fluorescence from spinach chloroplasts does not change during the period 0.5-50 s after the cessation of illumination. This provides experimental evidence that charge recombination processes originating in various charge pairs of photosystem II, and manifest as various kinetical components of long term delayed fluorescence, result in the excitation of the same emitters, as predicted by the charge recombination hypothesis.