Excilamps: Promising sources for exciting spontaneous fluorescence of organic molecules

We present the results of real and numerical experiments devoted to investigation of the spatial gradient of the intensity of chlorophyll fluorescence in the volume of a plant leaf. It is demonstrated for the first time that potential effective sources capable of exciting spontaneous fluorescence from the photosystem of a leaf are the exciplex lamps (exilamps) that generate continuous UV radiation. Estimations using the Monte Carlo method show that the main factor responsible for a transformation of the fluorescence spectrum during the passage of radiation through the volume of the leaf is the reabsorption process.