[shaver] spectra of ARGON 141 



atoms of any element should resemble the ordinary or arc spectrum 

 of the element immediately preceding it in the table of the elements. 

 If the ionization of the atoms is such as to remove two electrons, 

 according to this theory the spectrum due to the remaining system 

 should resemble the enhanced spectrum of the immediately preceding 

 element. This is a consequence of the theory that the outer electronic 

 configuration of the ionized atom of any element whose atomic 

 number isN, is the same as that of the neutral atom whose atomic 

 number is (A'^— 1); and similarly that the arrangement of the outer 

 electrons in the doubly ionized atom of atomic number A^, is identical 

 with that of the singly ionized atom of atomic number (iV— 1), and 

 also the neutral atom whose atomic number is (iV — 2) . This is readily 

 seen from the diagrams of atomic models shown in Fig. 2. 



-l.\ />. /^\ î^.\ 



- Uel,\. 



>D %*■ •:# {f> •.$*■ "% tf> vii' 



-ijJtisaS- -Btn//,„^ - - Bo^o-n - -ÇszàsS- -MAog*"- -Qygtn- - P,orme - 



/p}Vn /0|«\ /pÎ^v fp^ 



•)<r,«^,<i>è àn'.m^bh «<t'»^<ii 6a .'«C 



.^^ /:,-o^, ,';«^. /««TîN 



4^, (:?.M il^y. im>. ir^%\ ^'^i .{i}^ *{C|;}) 

 ^> \«4^y V-^t^V V'^T^/ >l-^/ '^1^/ ^5^' ^Xy 



— Or^o-n — J>- — /o?gss/t/7w — - Colciiim — 



Fig. 2 



The purpose of this investigation was to make a further test of 

 Sommerfeld's prediction by comparing the absorption spectrum of 

 argon in various states of ionization with that due to neutral and 

 ionized atomic chlorine or sulphur, since chlorine and sulphur are 

 the elements immediately preceding argon in the table of the elements. 

 Accordingly a study has been made of the absorption spectrum of 

 argon both neutral and ionized by various means, between the wave- 

 lengths X = 7000 Â.U. and X = 2150 Â.U. In no case was a definite 

 absorption observed either with the ionized gas or with the ordinary 

 gas at a pressure of 102.4 atmospheres. Up to the present time the 

 author has not investigated the absorption spectra of atomic chlorine 

 and sulphur so th,at in this paper the experiments with argon alone 

 are described. However, from the negative results obtained with 

 ionized argon, it may be predicted on the basis of the Sommerfeld 



