Beam-foil observations of Na I doubly-excited states

Abstract We identify a line at 3882.8 A as the 3 s 3 p 4 D 7/2 − 3 s 3 d 4 F 9/2 0 transition in Na I. 2p-3s transition of Na I are observed close to the corresponding Na II resonance lines at 372 A and 376 A.