FLUORESCENCE OF CHLOROPHYLL in VltVO 



1829 



Table 37C.IV 

 Quantum Yield of Fluorescence of Chlorophyll and Related Compounds 



(after Forster and Livingston 1952) 



" Extrapolated values, <po, for infinite dilution. 

 Fluorescence is very weak in dry benzene (p. 766). 



whether the yield of fluorescence is independent of the mutual orientation of the dipole 

 oscillations in the absorption and the emission band. 



The absolute fluorescence yield, found by Forster and Livingston for 

 chlorophyll a (24%), is considerably higher than that previously estimated 

 by Prins (about 10%). Re-absorption of fluorescence light, which is 

 much stronger for chlorophyll than for most other dyes, is the most prob- 

 able reason for Prins's low value. 



