368 



THE BELL SYSTEM TECHNICAL JOURNAL, MARCH 1956 



mental component of the electron charge density of the beam multiplied 

 by a constant 



/ Zq/o C 2uo 



2wo\ 

 h) 



(27) 



V 4C 2(1 + hC) 

 The ratio of the electron charge density to the average charge density, 



P«(2) 



Po 



2319^21 

 5 17/^,1 9 



^ +e 



Fig. 8(a) — y versus <f - hrj for QC = 0.2, k = 2.5, b for mi = 0.67 

 C = small. 



Ml (max) and 



