566 Mr. G. P. Thomson on the Spectrum 



and the ratio between the moved and unmoved intensity : 

 - _ Io __ h n \ + h n 2 



' ~ Jo ~" qi?h + gW. 



When the magnetic field is put on, moved as well as- 

 unmoved intensity is produced by the neutral rays : 



i_ 



Jm= q^e L *e*~ H , 



j- J-m^ *2 



/m — t — • 



Now the experiments give as the mean of four mea- 

 surements : 



,/f//m — 0*98, or approximately =1. 

 This gives 



A*c) K]il-^ ~\~ K2W2 fc\ 

 Qa ~ qini + q 2 n2 ~~ q{ 



Now if we assume that the positive as well as the neutral 

 rays, by their impact with the gas molecules in the obser- 

 vation chamber, produce "unmoved intensity," then q 1 is 

 different from 0, and as k 2 and q 2 are different from 

 k± must be different from 0. 



As the positive hydrogen nucleus cannot emit the series 

 lines, the positive hydrogen rays can only emit light at the 

 very moment they pass into the neutral state, and ^^O 

 means that light is emitted as the result of the neutralization 

 process. 



For other gases we have to reckon with the possibility 

 that the ray may emit light also in the positively charged state 

 as the result of such collisions with gas molecules, which do 

 not result in neutralization. 



Physical Institute, Christiania, 

 October 28, 1920. 



XLTX. The Spectrum of Hydrogen Positive Rays. 

 To the Editors of the Philosophical Magazine. 

 Gentlemen, — 



I WISH to thank you very much for allowing me to* 

 comment on Professor Vegard's paper. He ascribes 

 the differences which I found in the spectra of the hydrogen 

 positive rays to chance variations in pressure and in the energy 



