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This article describes time-resolved measurements of the laser induced chlorophyll fluorescence emission of vegetation detected by two different techniques. Fluorescence decay time measurements using single photon counting and picosecond laser pulse excitation have been used to analyse the fluorescence heterogeneity of leaves from higher plants. The fluorescence is described by lifetimes of 10-40 ps, 80-150 ps, 400-500 ps and 700-1000 ps. By closing the reaction centre via application of DCMU, the lifetimes of the two slowest components increase by a factor of about 3. Another possible way to monitor the fluorescence after ps-excitation is by a streak camera detection system. Measurements performed on the slow decay component of stressed and unstressed plants are presented.

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Authors: SCHMUCK G, JRC Ispra (IT);VERDEBOUT J, JRC Ispra (IT);KOECHLER C, JRC Ispra (IT);MOYA I, L.U.R.E., Université Paris (FR);GOULAS Y, L.U.R.E., Université Paris (FR)
Bibliographic Reference: Paper presented: IGARSS '90, Washington (US), May 21-24, 1990
Availability: Available from (1) as Paper EN 35311 ORA
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