INTERMITTENCY FACTOR IN FLASHING LIGHT 



1451 



(because of the exponential decline of the yield; cf. fig. 34.7). Finally, 

 after the intervals had become so long that practically all intermediates 

 associated with Eb after the flash are stabilized before the next flash {to. <C 



I 



Fig. 34.8. Flash saturation curves calculated from fig. 34.6 (after Weller and Franck 

 1941); T is the time between successive flashes (t = i* + to). 



Saturating 

 flashes 



Subsaturating 

 flasties 



t t t t f ! t t t 



Fig. 34.9. Length of dark intervals has no effect on yield of nonsaturating 

 flashes. Eb is the total available amount of Eb. The two dark-shaded areas 

 represent the yield of a single (subsaturating) flash with a long dark interval, and 

 the yield per flash of same intensity in the "stationary" state with short dark in- 

 tervals. They are equal. 



