The Spark Spectra of Silver and Palladium (Ag II and Pd II)—An Extension

An attempt was made to excite the $4f$ electron spectrum of Ag II in the Sch\"uler tube with helium. Failure is discussed assuming the excitation process Ag normal atom+He⁺. Some little extension was made to the lower spectrum. The Sch\"uler tube was also used to extend the 4d⁸6s and $5d$ configurations of Pd II. About forty terms were added. A complete list of lines arising from high levels is given.