100 



RADIATION HIOLOGY 



moved woll out into the visible reRion ((Iranick aiul (Jilder. 1047). 'i'iie 

 ehlorophylls show several minor absorption peaks in the speetral region 

 •28tK) :i8(H) A (Fis- .V22). Chlort)phylls a and b differ notably in their 

 absorption at about 3S(H) A (Harris and Zscheile. 1043). 



76 



68 - 



60 - 



52 - 



gAA 



X 



UJ 



^ 36H 

 u 



Ul 



a. 



V) 



28 - 



20 



12 



2600 



2800 



3000 



3200 3400 3600 3800 4000 4200 



WAVE LENGTH, A 



Fig. 5-22. I'ltraviolet absorption spectra of chlorophylls .\ aiul R in ethyl ether solu- 

 tion. (Harris and Zscheile, 1943; reproduced from the Botanical Gazette, puhlished hy 

 the University of Chicago Press.) 



FLAVINS 



As with the porphyrins, more attention has been devoted to the visible 

 absorption band of the flavins than to their ultra\ iolet spectra, which do, 

 however, possess strong bands at 223, 2(55, and 370 m/z, as well as the 

 visible band at 445 m/x (Fig. 5-23) (Warburg and Christian, 1938; Morton, 

 1942; Dagli-sh et al., 1948). 



PTERINS 



The renewed interest in the pterins has focused attention on their ultra- 

 violet absorption spectra, which generally contain one strong band in 



