The Spark Spectrum of Silver (Ag II)

The spark spectrum of silver can be based on a set of terms as follows: ³D, ¹D from the structure 4d⁹5s; ³¹P, D^', F from 4d⁹5p; ³D, ¹D from 4d⁹6s; ³¹S, P^', D, F^', G from 4d⁹5d. The theoretically lowest term ¹S₀(4d¹⁰) has not been found, but an estimate of its position is given. There is evidence also for the structure 4d⁹4f. All terms have intervals very different from the Land\'e values. The g-values also are evidently very irregular.The separate limits calculated from the ³D, ¹D series of two members show the same apparent divergence from theory as in Cu II, Ni I, Pd I. The intervals in the set 4d⁹5d also indicate divergence from theory. The calculated ionization potential is 17.1 volts from 5s³D₃.