Abstract
The (0,0) band of the B 2Σ+–X 2Σ+ transition of LaS near 726 nm has been studied at high resolution using laser vaporization/reaction supersonic free jet expansion and laser induced fluorescence spectroscopy. Spectra taken at a resolution of about 50 MHz show resolved hyperfine structure which is caused principally by the unpaired 6sσ electron in the ground state interacting with large magnetic moment of the 57139La nucleus with nuclear spin I=7/2. The X 2Σ+ state of LaS is in good Hund’s case (bβs) coupling, however, the upper state, B 2Σ+, is close to case (bβJ) coupling. A total of 1850 rotational-hyperfine transition lines have been assigned and measured. Accurate rotational, spin and hyperfine parameters for the B 2Σ+ and X 2Σ+ states have been obtained, which give information about the electron distribution in the molecule.
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