An Extension of the Analysis of the Spectrum of Neutral Samarium, Sm I

Abstract

The term $4{f}^{6}(^{7}F)6s7s^{9}F$ has been found, which yields 5.6 volts as the approximate ionizing potential of Sm I. The triad of terms $4{f}^{6}(^{7}F)6s6p^{9}GF{D}^{0}$ have been completely identified. Several new energy states have been located, which account for all previously unidentified low temperature lines. Experimental proof of the existence of more than 910 energy states which are necessary to account for existing data is pointed out. The extreme difficulty of analyzing the remaining data is discussed.