110 



RADIATION BIOLOGY 



Structures of Compounds in Fig. 2-22 



" Substituents designated as in Table 2-3, column "Code." 



* P, porphyrin polarization; C, chlorin polarization; see Fig. 2-20. 



/ = (180 + m, + m, + Mn - M^y (2-15a) 



for band I (neglecting the first term, which is relatively small) and 



/ = (^3 - m,)^ + (Ml -f M, + Miv - M„)2 

 for band III. For bacteriochlorins the formulas become 



/ = (360 -\- Mn - M„)2 



(2-1 6a) 



(2-156) 

 (2-166) 



for band I and 



/ = (M, + Ah + Mn - M„)2 



for band III; the numerical value in Eq. (2-156) may need to be changed 

 when more data are examined. 



In Figs. 2-22 and 23 the resultant moments determined in this way 

 are compared with the square root of the observed increase in intensity 



