IR spectrum of the AsH radical in its X3Σ–state, recorded by laser magnetic resonance

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Abstract
The IR spectrum of AsH in its ground 3Σ– state has been recorded using CO laser magnetic resonance (LMR). Several molecular parameters of AsH have been determined for the first time. In particular, arsenic nuclear hyperfine structure has been resolved, and the observation of the v= 2–1 and 3–2 hot bands of AsH has allowed an accurate determination of the vibrational anharmonicity, ωexe. Other molecular parameters have been determined more accurately, since Lamb-dip spectra have been recorded, and ΔΩ=±1 transitions of AsH in its X 3Σ– state have been measured.