Abstract

The neutral lithium spectrum plays a pivotal role in modelling the solution for a four-body problem. The most recent improvement in Li I energy levels appeared in the late 1950's. Since then energy level spacings due to electronic structure and electron-nuclear interactions have been measured by many spectroscopic techniques. The energy levels are of un-even accuracy because of variable wave number accuracy, including the relatively poor accuracy of the resonance lines at 6707 Å(±0.003 cm^-1) and the infrared data measured with 1950's grating technology. To remedy this situation we remeasured the ⁶Li and ⁷Li spectra (3,000 to 30,000 cm^-1) by using the 1-m McMath Fourier Transform spectrometer at Kitt Peak. A by-product of the FT measurements will be a consistent set of relative oscillator strengths.

© 1992 Optical Society of America