Range: ±0.006 Table - link Oxygen molecules/photon
||Björkman O. & Demmig B. (1987) Photon yield of O2 evolution and chlorophyll fluorescence characteristics at 77K among vascular plants of diverse origins. Planta 170, 489–504. DOI: 10.1007/BF00402983
||Many of the photon-yield and fluorescence determinations on plants grown in their native habitats were made in North Queensland, Australia, during the period from May through October 1983. Rates of photosynthetic 02 exchange were measured at 25.0degrees C and CO2 saturation with a system incorporating a leaf-disc electrode (Model LD-2 Hansatech, Kings Lynn, Norfolk, UK) designed by Delieu and Walker (1981, 1983), and a fan-cooled quartz-lamp housing, designed and built in this laboratory.
||For 2 plants of 2 families. Kitajima and Butler (1975) proposed, on theoretical grounds, that the ratio of variable to maximum fluorescence (Fv/Fm) emitted from photosystem II (PSII) at 77 K may serve as a quantitative indicator of the efficiency of the photochemistry of PSII.