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 (1⁶s term) and occur in groups of 1, 2 and 3 lines. Five absorption lines represent 1⁶s-⁶d^' combinations for which the rule of inner quantum numbers is obeyed but the azimuthal quantum number changes by 2. Four lines are 1⁶s-⁸p combinations and twelve are 1⁶s-⁶p combinations. Some of the remainder are perhaps 1⁶s-⁴p and 1⁶s-²p combinations.