342 



Mr. H. Bell on Atomic Number and 



Argon a relationship similar to that in As, Sb, Bi, the fre- 

 quencies being A r + 846*47, A r +1649*68, and A r + 2256'71. 

 In Neon, again, according to Watson f there are triplets, one 

 of the intervals beinj," 417*45 cm. -1 . The line joining 

 (1649-68, A) to (417*45, Ne) has for equation 



Vn=m(N-N ) = 2*523(N--l-90). 



This indicates for He (N = 2) the value v=*06 cm. -1 instead 

 of about unity (Dunz gives 1*05). The line has not been 

 drawn in the diagram ; it requires for Krypton the interval 

 7402 cm." 1 . 



The following tables contain the wave numbers whose 

 square roots have been plotted in the diagrams. The first 

 of the columns marked " v calc." gives the values calculated 

 from the equation y/v = mQ$ — N ), m and N having the 

 values indicated. Least square methods were employed 

 where more than two points were used to determine the 

 line. The second " v calc." column is calculated from 

 log v—p\ogl$-\-q. In each case only two pairs of values 

 of v and N were used to determine p and q ; the results 

 show clearly which values were chosen. 



VV = wi(N — N ). log v =p log JS + q. 



Doublets. 



v obs. v calc. v calc. v obs. v calc. v calc. 



Li -34* 



Na 17-21 



K 5790 



Eb 237-71 



Cs 564-10 



•25 



16-48 

 58-0 

 2440 

 558-3 



103 

 17-21 

 56-17 



237-7 

 560-8 



K 57-90 



Cu 248'13 



Ag 920-56 



Au 3817-20 



58-1 



247-6 



9209 



31720 



95-2 



248-1 



920-6 



3771-0 



m= -4447. 

 p =2-1645, 



Be 



Mg 92-0* 



Ca ...... 222-9 



Sr 801-3 



Ba 1690-5 



Ea 4858-0* 



N„ 



1-875. 



-1-01832. 



11-4 



84-5 



225-5 



794-7 



16990 



4162-0 



14-6 



81'6 



222-9 



788-2 

 1690-5 

 4114-0 



m= -7279, N =--630. 

 i? =1-96777, q =-'21202. 



B 



Al 11207 



Ga 823-6* 



In 221263 



Tl 7792-45* 



6-14 

 112-07 



831-3 

 2212-63 

 6323-0 



112-1 



790-6 



2212-6 



6859-0 



m= '8117, N = 9-619. 



p =271512, q =-1-57591. 



Mg 920* 85-2 113-4 



Zn 872-4 872-4 872-4 



Cd 2484-1 2484-1 2484-1 



Hg (?) 73870 6904-0 



p =2-22639, q = - -34793. 



m= 1-0136, N = 2-556. 

 p =2-24798, q =- -45462. 



+ Camb, Proc. xvi. p. 130 (1911); Astroph. Journal, xxxiii. p. 399 

 (1911). 



