ELECTRON STREAMS IN A DIODE 833 



The symbols are introduced and defined as needed. The following partial 

 list is included to give the reader a general idea of the symbolism : 



General Symbols 



a,b Subscripts referring to the diode planes 



X Distance from the first plane 



/ Length of diode space 



t Time 



T D-c. transit time to x 



T D-c. transit-time across the diode 



CO 2ir Frequency 



p Space-charge density 



f D-c. space-charge factor 



€ Permittivity of vacuum, ztt— 



oott 



ri Acceleration constant of an electron 1.77-10^*. 



Symbols in Section 2 — The General Solution 



V Voltage 



E Electric intensity 



U Idealized electron velocity 



Q Conduction current density 



/ Total current density 



Id D-c. component of / 



I A Oscillating component of / 



Idt 



eE+l 



I'" 



S ^ + / ^^^^ 



Fi{S), FiiS) Arbitrary functions of S 



A{S), B{S) Finite arbitrary functions of S. 



Symbols in Section 3 — Small Signal Theory 



In this section the capital letters V, E, U, Q and / change their meaning 

 and indicate only the d-c. components of their quantities; and the small 

 letters v, e, u, q and i then indicate the ampUtudes of the corresponding 

 a-c. components. This section also uses the following special symbols: 

 A, B Arbitrary constants 



A* B*. . . .1* Coefficients for the circuit theory of a diode. 



