1028 Dr. A. C. Crehore on 



where n is a whole number. This is 



election = f X{r~ 2 + pa*f x , 18 (U) r~ 4 + pa*f x , 20 (TJ)r~« 



+ P a% 2 2(U)r- s + pa s f It2i (U)r- l o...}, . (16) 



with a similar expression for the ^-component, having Z 

 instead o£ X ontside the brace, and ^-functions within. 

 These functions are 



/ I;18 (U) = -i/,, 4 (U) = -| of (2) above. 

 /*,2o(U>=-!/*.6(TJ) = -i„(3) „ 



/x. 22 (U)=-|/ I)8 (U) = -4„(4) „ 

 / Xi24 (U) = -i/ I , 1 „(U)=-|„(5) „ 



/; il8 (U)=-i,/;, 4 (U)=-i„(9) „ 



/,,2»(U)=-i/„e(U)=-i„(10) „ 



/•, 22 (U) = -iAs(U) = -i„(ii) „ 

 /,. 2 4(U)=-i/;, 10 (U)=-i„(i2) „ 



Fig. 1. 



Sectional view of two hydrogen atoms with parallel axes, ABC and 

 abc. The electrons are represented as straight lines, since the ring^ 

 and point approximation projects into a straight line. 



The diagram, fig. 1, may represent the sectional view of 

 the two hydrogen atoms now under consideration. ABC is 

 the first atom, and abc the second. The distance, r, may be 

 chosen as the distance between the centres o£ the positive 



