Abstract
The rotational transition 101–000for InOH in its ground1A′ state has been detected with a pulsed microwave spectrometer; the molecule was generated by laser ablation of indium(III) hydroxide, In(OH)3. The same transition has also been recorded for two of its isotopomers, In18OH and InOD. Hyperfine structure arising from both the115In and1H (or2D) nuclei was observed. The results have been combined with others from UV spectroscopy to determine anr0structure for the molecule:r0(In–O) = 0.20167(4) nm,r0(O–H) = 0.0911(4) nm,∠InOH = 132.0(3)°.These values reflect the very marked effect of averaging over a large-amplitude bending vibration in InOH in its zero point level. Values for the115In and2D electric quadrupole coupling constants and for some smaller, magnetic hyperfine terms are also derived.
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