SOME CO.XTEMPOR.IRy .IPr.lXCF.S IX I'llVSICS llll 42.1 



clitTiTt'iirt's iH'IWft'H tlu'ir fiKTK>-valiii's (tisualK', liowi-vi-r, thfso 

 (listaruTs an- distorU-d for convi-iiience). Tlu- i-iuTny-valuos, cx- 

 pri'ssftl in t(iiii\alcnt volts, art- aftixi-d to tlu- liius; on tlic left, they 

 are measured from the normal state of the neutral atom as /.cro of 



■feTiOtf »r: I ■■-it 

 lQ!Nt2.E.O WTOr- r 



fcJLCITE-O 3TfiTE.3 



or flT,o^fl. 



£0.55 • 



" 19 7S: 





iy^^-\ ■■ i.t- i,' 





E-lsteGi 







1 



-H^ 



:.[^! 



:^i^:^l-^Fl^i.:|:::i:::l:n-|.i.±:i:: 



l-ig. 1 — Uiagram of the stationary states of helium, dctcrniined liy the method of 

 electron-impacts 



