The Spectrum of Neutral Tungsten, W I

An analysis of the W I spectrum has yielded 300 levels, of which 201 have been given tentative magnetic $g$ values. Configurations, as well as $L$ and $S$ values, have been assigned to the 65 levels $5d^{4}6s^2{}_{}{}^5{}_{}{}^{}D{}_{}{}^3{}_{}{}^{}H\mathrm{GFDP}$, $5d^{5}6s{}_{}{}^{7,5}{}_{}{}^{}S{}_{}{}^5{}_{}{}^{}G$, $5d^{4}6s\left({}_{}{}^6{}_{}{}^{}D\right)7s{}_{}{}^{7,5}{}_{}{}^{}D$, $5d^{4}6s\left({}_{}{}^6{}_{}{}^{}D\right)6p{}_{}{}^{7,5}{}_{}{}^{}\mathrm{FDP}$ with 18 definite ambiguities due to a mixing of eigenfunctions. All the low levels are believed to be known. The ionization potential is (7.94±0.1) volts. A rectangular array of the transitions is given.