We have observed approximately 50 new lines in the spectrum of a beam of foil-excited lithium ions (0.5–1.0-MeV beam energy) in the wavelength region 2000–11 000 Å. One line is classified as a transition in doubly excited Li ii, and the remainder are attributed to transitions between highly excited levels in Li ii, and to transitions in the doubly excited quartet and doublet systems of Li i. Six lines remain unidentified. Mean lives have been measured for some of the new Li i transitions. They help to verify the suggested identifications.
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Accuracy of ±2 Å.
Relative to the Li i ground state, assuming an energy of 57.442 eV for the 1s2s2p4P° level.
Energy given relative to the 1s2p2 2P level. The energy in parentheses is that calculated by Weiss (quoted in Ref. 4).
Assuming the energy of 1s(2s2p1P) 2P° is 60.390 eV, from Ref. 18.
As defined by L. J. Curtis, H. G. Berry, and J. Bromander, Physica Scripta 2, 416 (1970).
Blended by Li ii, 3s2S–7p3P° at 4763 Å.
Added in proof; measured at 110-keV beam energy.
Accuracy of ±2 Å.
Relative to the Li i ground state, assuming an energy of 57.442 eV for the 1s2s2p4P° level.
Energy given relative to the 1s2p2 2P level. The energy in parentheses is that calculated by Weiss (quoted in Ref. 4).
Assuming the energy of 1s(2s2p1P) 2P° is 60.390 eV, from Ref. 18.
As defined by L. J. Curtis, H. G. Berry, and J. Bromander, Physica Scripta 2, 416 (1970).
Blended by Li ii, 3s2S–7p3P° at 4763 Å.
Added in proof; measured at 110-keV beam energy.