1842 



SPECTROSCOPY AND FLUORESCENCE OF PIGMENTS CHAP. 37C 



The absorption peaks of the species studied were located at 680 mju, 

 with indication of bands at 640 and 600 mju, and a minimum at 550 m/x 

 (c/. table 22. Ill on p. 699). The average absorption was 92% at 400- 

 500 mju, 71% at 500-600 mfx, and 84% at 600-700 m^; over-all average for 



400 



500 600 



WAVELENGTH- m mu 



700 



Fig. 37C.24. Ab.sorption and retlection curves of singlel eave.s of .six species, 

 together with smoothed average curves for bean, spinach, Swiss chard, and 

 tobacco (after Moss and Loomis 1952). Average reflection of green Hght 

 (550 mju), 17%; average absorption, 62%. 



the region 400-700 m^ was 82% absorption, 10% reflection and 8% trans- 

 mission. 



Boiled leaves showed a general slight reduction in absorption and 

 reflection, and a slight shift of band peak toward shorter waves, cf. p. 698. 

 (In some species, the changes were more drastic, indicating chemical de- 

 composition of the pigment.) Dipping in ether caused in spinach leaves a 

 much stronger decrease in absorption, particularly in the green, and a wider 



