The rotational spectrum and hyperfine structure of the methylene radical CH2 studied by far‐infrared laser magnetic resonance spectroscopy
Thirteen pure rotational transitions of CH2 in its X ̃ 3 B 1 ground vibronic state have been
measured and assigned using the technique of far‐infrared laser magnetic resonance
(LMR) spectroscopy. The energy levels thus determined led to the prediction and
subsequent detection by microwave spectroscopy of a further rotational transition 404–313,
at lower frequency (∼ 70 GHz). The analysis of these observations yields precise rotational
constants as well as spin–spin, spin‐rotation, and hyperfine interaction parameters for gas …
measured and assigned using the technique of far‐infrared laser magnetic resonance
(LMR) spectroscopy. The energy levels thus determined led to the prediction and
subsequent detection by microwave spectroscopy of a further rotational transition 404–313,
at lower frequency (∼ 70 GHz). The analysis of these observations yields precise rotational
constants as well as spin–spin, spin‐rotation, and hyperfine interaction parameters for gas …
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