LNSKAItt 



Introduction. 



In a previous paper' published in the Phil. Mag. for April this j^ear 

 I have tried to explain the .Y-ray spectra from definite conceptions 

 with regard to the syeteni of electrons which surround the positive 

 nucleus. 



My theory of A'-ray spectra was based on the assumption that the 

 quant-number of the ellectrons surrounding the nucleus is not constant 

 and equal to one (Bohrs hypothesis), but increases as w^e pass outwards 

 from the nucleus — from one ring-system to another. 



With regard to the way in which the .Y-ray spectra are produced 

 the following two possibilities were considered : — 



i) An .Y-ray line is produced by the recombination of an electrort 

 from a 'secondary' stability circle of a heigher quant-number to the 

 'primary' circle which has lost one electron. 



2) The A"-ray line is produced by the recombination of an electron 

 belonging to one of the outer 'primary' stability circles to the broken 

 primary system (the one which has lost one electron). 



General formulae for the calculation of the frequency were given 

 for both the possibilities mentioned (Equations 15 and 16 Paper I.). It 

 should, however, be remembered that any of these tw^o asumptions needs 

 some additional hypothesis, if the frequency formula is to be derived 

 without ambiguity. 



It is mv intension in this paper give a more complete discussion 

 of the various possibilities with regard to the process of recombination, 

 and to draw some of the consequences to which they lead. 



1 L. Vegard, The A'-Ray Spectra and the Constitution of the Atom. Phil. Mag. XXX V 

 p. 293, T918. This paper will be referred to as Paper I. 



