1 78 On Radiation Phenomena in the Magnetic Field. 



the first zinc triplet consists of the lines 4810*7, 4722, 4680. 

 Each of these triplets belongs to Kayser and RungVs second 

 Nebenserie, being the first terms, corresponding to n = 3, in 

 their formula. We should consequently expect these groups 

 to behave similarly in the magnetic field and to show effects 

 which are similar for corresponding lines. That this expect- 

 ation is realized is shown by the following table : — 



Magnesium. 



Cadmium. 



Zinc. -mje or \ 2 /8\. 



Character. 



5183-8 



5086 



4810-7 18 approx. 



Diffuse triplets. 



5172-8 



4800 



4722 11-5 „ 



Quartets. 



5167-5 



4678 



4680 10 



Pure triplets. 



Thus the corresponding lines 5183'8, 5086, and 4810*7 of 

 the different substances possess the same value for m/e, while 

 the other corresponding lines also possess a common value 

 for the quantity m/e. The value of this quantity changes 

 from one set of lines to another, showing, as we should expect, 

 that the different sets arise from differences in the source 

 which produces them. 



Not only is the quantity m/e the same for corresponding 

 lines in homologous spectra, but, as shown in the above table, 

 the character of the magnetic effect is also the same for 

 corresponding lines. Thus, while the lines along the lowest 

 row, 5167-5, 4678, 4680, are all of the pure triplet type, the 

 lines of the middle row all become resolved into similar 

 quartets in the magnetic field, and the lines forming the top 

 row are all somewhat diffuse and show as " soft " triplets of 

 which the constituents may be really complex on further 

 resolution. 



It thus appears that the observation of radiation pheno- 

 mena in the magnetic field is likely to afford a valuable means 

 of inquiry into the so far hidden nature of the events which 

 bring about the radiation from a luminous body, and also to 

 give us, perhaps, some clearer insight into the structure of 

 matter itself. 



