Abstract

The far-infrared laser magnetic resonance (LMR) spectrum of the CH radical in the v = 0 level of the X 2Π state was studied in detail. Nine transitions that are accessible with currently available laser lines were recorded. The measurements were analyzed and subjected to a single least-squares fit using an effective Hamiltonian. The data provide primary information on the rotational and fine-structure intervals between the lowest rotational levels. They also yield values for the Λ-type doubling and proton hyperfine splittings in the same levels.

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