( m ) 



Physics. — "Magnetic resolution of spectral lint's and magnetic 

 force." By Prof. 1'. Zbkman. (Second part). 1 ) 



Asymmetry in strong fields. 



'2. By means of the method of the non-uniform field, described 

 in the first part of this communication, it is possible to survey at 

 one glance a phenomenon dependent upon the intensity o) the 

 magnetic field for a series of different intensities, all other chcum- 

 stances surely being the same. 



I there proposed to use tins method for a more minute study 

 concerning an asymmetry of the resolution of spectral lines first 

 predicted from theory by VblGT ') and lately considered by Lorkntz : 'i 

 from another point of view. 



The theoretical result of VoiGT, applying to the case of resolution 

 into a triplet, may be given in his own words: "dass das normal 

 zu den Kraftlinien wahrnehmbare Duplet der parallel zn R [magnetic 

 force] polarisirten Componenten bei kleineren Feldstarken in der 

 Weise unsymmetrisch ist, dass die nach lint liegendt Componente die 

 grössere Intensiteit, die nach Violett hin liegende aber den grosseren 

 Abstand von der ursprünglichen Absorptionslinie besitzt." Voigt here 

 mentions an absorption line because he considers the so called in- 

 verse effect, by reason however of the parallellism of the pheno- 

 mena of emission and absorption, the emission lines show analogous 

 phenomena. 



The amount of the asymmetry of the distances, i. e. the difference 

 of the distances of the outer components from the middle line, ought 

 to be on Voigt's theory independent of the strength of the magnetic 

 field. Moreover it is to be inferred that the described asymmetry 

 must be scarcely observable. 



On a former occasion J ) 1 have given some examples of asymme- 

 trical resolution and measurements since published by other physicists 

 undoubtedly go far towards confirming these results. 



A more minute investigation of the course of the magnetic separa- 

 tion, when the scale of field intensities from large to small values 

 is traversed, is I think still of great theoretical interest. The most 

 interesting parts of the scale are of course the very strong and the 

 weak fields. 



x ) Continued from Proceedings of April 1906. 



*) Voigt. Ann. d. Phys 1. p. 376. 1900. 



3 ) Lorentz. These Proceedings November, December 1905. 



*; Zeeman, ibid. December 1899. Aichiv. Néerl. (2) T. 5. 237—242. 1900. 



