Abstract
The electron paramagnetic resonance studies of methylene arc reviewed. The structural information that resulted include verification of the triplet multiplicity of the electronic ground state, the discovery of a bent geometry for the molecule with a bond angle of 134°, measurement of the zero-field or fine-structure splitting parameters, measurement of the g-factor tensor, and measurement of the isotropic and anisotropic 13C hyperfine interaction. The results are compared with recent measurements obtained with laser magnetic resonance techniques and theoretical treatments.

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