The Absorption Spectrum of Manganese Vapor in the Visible and Ultraviolet

With an absorbing column of the vapor about 3 cm long heated to temperatures between 1200°C and 1600°C, absorption was observed at 31 lines. Grotrian had previously reported absorption at 6 of these lines. All of the absorptions are from manganese atoms in the normal state ($1{}_{}{}^6{}_{}{}^{}s$ term) and occur in groups of 1, 2 and 3 lines. Five absorption lines represent $1{}_{}{}^6{}_{}{}^{}s-{}_{}{}^6{}_{}{}^{}d_{}^{\prime }{}_{}{}^{}$ combinations for which the rule of inner quantum numbers is obeyed but the azimuthal quantum number changes by 2. Four lines are $1{}_{}{}^6{}_{}{}^{}s-{}_{}{}^8{}_{}{}^{}p$ combinations and twelve are $1{}_{}{}^6{}_{}{}^{}s-{}_{}{}^6{}_{}{}^{}p$ combinations. Some of the remainder are perhaps $1{}_{}{}^6{}_{}{}^{}s-{}_{}{}^4{}_{}{}^{}p$ and $1{}_{}{}^6{}_{}{}^{}s-{}_{}{}^2{}_{}{}^{}p$ combinations.