372 



88 



Table XIII. 



Hydrogen, //„, 6562 Å (3-* 2). 

 New components (Perturbing field 300 V"li/cM) 



Component j Transitions 





R"' 



s{R-') 



S(Ä"2) 



Wave length 



. 03 ^ 11 Par. 03; 1 -> 11; 1 

 Perp. 03; 2 11; 1 





 





 





 





 



6562,70 Å 



12 ^ 02 ! / 12; 2 02; 2 

 , ^ \ 12; 1 - 02; 1 

 Perp.|12;2^02;l 

 ' \ 12; 1 ^ 02; 2 



0,91 

 3,54 

 



0,82 





 

 

 



4,4 



0,8 





 



2,86 



21 ^ 11 Par. 21; 1 -> 11; 1 



0,27 



.0045 



0,3 



.oo5 



2,75 



Original components 







n'^R''^. 



^lin'iR-' 



Wave length 



03 ^ 02 

 12 ^ 11 

 21 02 



1,00 

 0,50 

 0,04 



1,00 

 0,35 

 



2,00 

 0,67 

 0.03 



1,33 

 0,23 

 



6562,84 Å 

 2,72 

 2,89 



•steady voltage is applied to the vacuum lube; the other to the "spark discharge 

 image" ( ''Funkenbild"), which appears when the tube is exposed to an interrupted 

 spark discharge. The heights and breadths of the hatched extensions representing 

 the components are cliosen so as to represent approximately the observed inten- 

 sity and degree of diffusion. For the sake of the following discussion the observed 

 components are, as shown in the figure, characterised by the ciphers I, II, . . ., VII. 



When comparing the observations with the theory it will in the first place 

 be seen that, although the spectrogram corresponding to the continuous discharge 

 undoubtedly approaches more than the spectrogram obtained by the application of 

 an interrupted discharge to the aspect of the theoretical fine structure of the spec- 

 tral line of the undisturbed atom, both images given by Paschen differ essentially 

 from it, because the components corresponding to (81-^21) and (31^03) are pre- 

 sent on both of them.') 



The strongest three components I, II and III in Paschen's continuous discharge 

 image correspond, in agreement with the theory, to the three transitions (04 03), 



') Since at the time of Paschen's experiments a spectrogram of the fine structure would rather 

 be considered as showing the normal effect when the maximum number of components appeared, no 

 special attention seems to have been paid to an examination of the experimental conditions under 

 which the smallest number of components appeared. In order to test the predictions of Bohr's theory 

 the latter point has been examined by Dr. H. M. H.^nsen at the Copenhagen physical laboratory. Although 

 this investigation has not yet been completed, some preliminary pliotographs of the line 4686 A, taken 

 by application of a low voltage to the vacuum tube, indicate that the components (31 —►21) and 

 (31 ->03), if present at all, were at any rate less intense compared witli the main components 1, II ami 

 III than in the spectrograms published by P.^schkn 



