Abstract
The molecular-beam laser-radio-frequency double-resonance method has been used to measure the spin–rotation and magnetic hyperfine structure of yttrium monosulfide (YS) in its X 2Σ+ electronic ground state. The spin–rotation constant γ is found to be positive, unlike that of YO. The Fermi contact and dipolar hyperfine interactions (due to the spin I=1/2 of 89Y) are found to be rather close to the corresponding quantities in YO. The contact hfs constant b in the excited B 2Σ+ state of YS was determined by combining the directly measured X 2Σ+ splitting information with B–X optical hfs observations.
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