Abstract
YH molecules were produced by laser vaporizing yttrium in the presence of He doped with H 2 or NH 3. Stark spectra were recorded for four bands in the 19 300–19 800 cm −1 region at electrostatic fields up to 16 kV/cm. Stark measurements proved useful in establishing rotational and Ω quantum number assignments. The permanent electric dipole moments (in Debye) were measured to be: 1.569(64), 2.325(8), 3.316(11), 2.273(6), and 1.537(8) for the X 1Σ + ground state and the 19 385, 19 746, 19 572, and 19 575 cm −1 excited states, respectively. Strong variation of the effective Ω quantum number with J was detected for the 19 572 cm −1 state.
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