1034 THE BELL SYSTEM TECHNICAL JOURNAL, OCTOHKK 1051 



On Fig. A2 we show the values of x. Equ. (A7.51) leads to values of ac < 3 

 for 29S°K and x < 2ior .193°A'. Although tlie approximation of Iiv (acousti- 

 cal) < kT breaks down, extraj)()laliiig the acoustical scattering into the 

 higher range involves some comj)cnsating cfTects. 



The effective "temperature" 7\. of (he electrons may be taken on the basis 

 of this approximate treatment to be pn)i)()rti()nal to vi. In order to make 

 Tt become equal to T for zero field, we (\c\\\\c Tehy the equation 



Te = Tvl/vl = x^ hv/k 



(A7.52) 

 = 520 x'. 



Some temperatures deduced from this equation are also shown on Fig. A2. 

 Some of the data of Fig. 2 are also repeated in Fig. A2. In addition some 

 earlier data''^ are also shown. These data extend to a somewhat higher 

 range and appear to show the upward tendency predicted by the theory. 

 The scale of temperatures indicates that for the extreme conditions experi- 

 enced electron "temperatures" of about 4000°iir have been produced. 



w E. J. Ryder and W. Shockley, Phys. Rev. 81, 139 (1950). 



