The third spectrum of copper (cu III)

Abstract

An analys is of Cu III based on o bservati ons from 500 to 6900 A is prese nte d . The low struc tures 3d 9 an d 3d B 45 a re comp le te , inc! udin g th e rare ly, if e ve r before , found 3dB (IS )45 2S. Th e 3d' 4s2 includ es 'F, ' F , 'C, and 2H but th e 'P, 2P, a 2 0 , b 20 have e lud ed all atte mpts to find th e m. Th e ionizat ion pote n tial calc ulated from 45 , 55 , 65 'F.'/2 is 296980 c m _ 1 but by a comp arison with Ni II whi c h ha s a lo nge r series a n approx im ate valu e of 297 140 ca n be estimated . Th e 3d"4d gro up is co mpl e te, e xce pt for one leve l, as is 5d base d on 3F and IG , the oth e r 5d groups bein g in co mplet e. 3dB(3F)4fis co mple te a nd 26 le ve ls based o n 10, 3P , IG are kn ow n. 3dB(3 F )5g is in c omple te and a fe w le ve ls base d o n 10 a nd IG have bee n fo und. A di sc ll ss ion of th e validity of th e analysis of C u I V by 1. F. Sc hrode r a nd Th. A. M. Va n Kl eef is giv e n.