Abstract
The CH(A 2Δ)–Ar van der Waals molecule provides a prototypical example of a Δ2 state complex. The rovibronic structure of CH/D(A)–Ar has been examined by recording rotationally resolved spectra for the A–X transition. The spectra are dominated by vibrational progressions of the intermolecular stretch in combination with two bending states. Rotational energy level patterns were consistent with a linear equilibrium geometry for CH(A)–Ar. Parity splittings resulting from vibronic interactions were below the resolution of the present measurements. Spectra for the A–X transition of CD, recorded incidentally in this study, reveal an error in the previously accepted assignment of the 0–0 band R2(1/2) line.
Published Version
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