48 



RADIATION BIOLOGY 



responds to ionization of the molecules. Absorption bands in the infra- 

 red range correspond to various forms of excitation of the vibration and 

 rotation of the atoms with respect to one another. The absorption 



Table 1-3. Absorption and Scattering of Electromagnetic Radiation in 



Different Frequency Ranges 



> 



bC 



_d 



03 

 <U 

 <-, 



o 

 C 





I— I 

 !X) 

 I— I 



> 



< 

 H 



h:; 

 O 

 I— I 



> 

 < 



Pi 



a 

 <u 



C3 

 o 



o 



a 



bC 



a 



o3 



is u 



o ^ 



bC Oj 



bC 

 u 



bC 



m 

 O g 







■73 C Oj 





bC ^ 

 O O 



bC 



bC 



03 

 u 



C 



bands in the visible and ultraviolet correspond to the simultaneous excita- 

 tion of an electron and of interatomic vibrations and rotations. These 

 bands can be resolved in a multitude of "lines" with a good spectroscope, 

 provided the absorbing substance is in a gaseous state and at a low pres- 

 sure; otherwise the adjacent molecules disturb each other's internal 



