﻿Magnetic Rotation Spectra of Sodium Vapour. 

 Green Rotation Spectrum. 



503 



1 



522534 



7 



5040-65 



2 



4839-56 



I 



521849 



2 



5033-54 



9 



4837-49 



1 



5212-02 



o 



5025-66 



2 



4819-43 



1 



5186-70 



3 



5003- 12 broad 



1 



4814-60 



1 



5179-71 



10 



5001-57 



1 



4812-68 



I 



5172-98 



5 



4979-34 



3 



4810-16 



1 



517198 



2 



4970-85 



3 



4802-62 



I 



516904 



1 



4967-10 



5 



4792-67 



1 



5165-85 



1 



4964-39 



3 



478289 



1 



5147 50 



9 



4962-85 



1 



4777-00 



1 



514071 



1 



4958-62 



1 



4766-94 



3 



5133-73 



4 



4933-93 



6 



4756-69 



3 



512654 



5 



4932-64 



1 



4752-04 



2 



5119-34 



3 



492432 



2 



4738-51 



1 



5095-70 



4 



4912-10 



4 



4727-52 



2 



5094-78 



1 



490467 



1 



471690 



7 



5087-31 



1 



4903-38 



1 



4715-63 



7 



5079-78 



1 



4896-65 



1 



4703-78 



2 



5071-58 



1 



4894-58 



2 



469254 



1 



5052-83 



1 



4892-77 



2 



4670-30 



1 



5049 56 



2 



4883-81 







5 



5U4849 



3 



4865-59 







twelve-foot grating. As will be seen, the bright lines coincide 

 with the bright lines of the magnetic spectrum, though much 

 broader. It will be easier to explain how the series were 

 picked out after we have commenced the study of the 

 fluorescence. I have added to PL XI. spectrum i, the magnetic 

 spectrum with the series indicated. There appear to be 

 five distinct series and a number of lines which thus far have 

 not been brought into any definite relation with one another. 

 These series we will number 1, 2, 3, 4, and 5. All the lines 

 belonging to the first series have one dot under them, those 

 belonging to the second have two dots, &c. These series 

 are shown separate on the chart (PL XV.) at the top. 

 Absent lines are indicated thus : Q. 



The fifth series is at the top, the fourth next, and so on 

 down, the extra lines being indicated in the lower row. This 

 arrangement is considered provisional : it is the best that I 

 can do at the present time, and I believe that it is correct in 

 the main. We shall see presently, however, that photographs 

 of the fluorescence stimulated by monochromatic radiation 

 will have to be made with the large concave grating before 

 we can be absolutely sure of all the lines. We will drop the 

 magnetic spectrum for the present, and consider 



The Fluorescence Spectrum. 



In the previous paper I have described some of the 

 remarkable changes which take place in the distribution of 



