Abstract
Fluorescent emission kinetics at 685 nm of in vivo escarole chloroplast chlorophyll has been studied on a picosecond time scale using a frequency-doubled, mode-locked Nd: glass laser (4-ps wide pulses) and an optical Kerr gate. The fluorescent risetime is less than 10 ps and the decay time of the fluorescence envelope is 320 ± 50 ps. An apparent dip in the time dependence of the decay kinetics occurs at about 50 ps after the flash. This may be the result of energy transfer between carotenoids or chlorophyll b and chlorophyll a or an indication that two independent species are fluorescing.
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