PROF. A. FOWLER ON SERIES LINES IN SPARK SPECTRA. 
239 
§ 5. The Doublet System of Magnesium. 
The spectrum of magnesium, as is well known, also contains doublets similar to those 
occurring in calcium, strontium, and barium. They do not appear in the flame 
spectrum ; they occur in the arc and are certainly intensified in the spark, and are 
therefore to be regarded as enhanced lines of Class I. Lorenser has discussed these 
lines, but has not identified any associated Fundamental series such as were found for 
the other three elements. The lines in question are indicated in Table V. 
Table V.—Magnesium Wide Doublets. 
Diffuse series. 
Sharp series. 
A. 
n. 
m. 
X 
m. 
(Rowland). 
Lor. 
Fow. 
(Rowland). 
Lor. 
Fow. 
- 2795•63* 
- 2802-80* 
- 35,759-9 
-35,668-4 
1-5 
1 
2798-07 
2790-88 
35,728-7 
35,820-7 
3 
2 
2936-61 
2928-74 
34,043-1 
34,134-6 
2 • 5 
2 
1737-8 
1735-0 
57,544 
57,637 
4 
3 
1753-6 
1750-9 
57,025 
57,113 
3-5 
3 
Unfortunately, the observed lines are so few that the equations of the two series can 
only be determined completely by utilising all the lines in the calculation of constants, 
the limit derived from the Sharp series being assumed for the Diffuse. Lorenser’s 
form uke with the numeration indicated in Table Y. are 
o/ x 84,893'0l 413,202-5 
{m) “ 84,984-5J (m + 0-35060) 2 ’ 
T) / \ 84,893'0\ _ 423,376-6 
W _ 84,984-5 J (m + 0'065474) 2 ' 
The Hicks fonnuke for these series, with the numeration shown under “ Fow.'’ in 
Table V., are 
Q / x _ 85,479-8 
S ( m ) 85,571-3 
-n/ \ _ 85,479"8\ 
1 ^ 85,571-3 I 
4 x 109,675 
, n-ooorm 0-036421Y 
m +0 938644-) 5 
m 
4 x 109,675 
m + 0'949439 — 
Q'040110 \ 2 
m / 
Also the first doublet of the Principal series. 
