Abstract
The 79-\ensuremath{\mu}m electric dipole spectrum of OH ($^{2}\ensuremath{\Pi}_{\frac{3}{2}},J=\frac{3}{2}\ensuremath{\leftrightarrow}^{2}\ensuremath{\Pi}_{\frac{1}{2}},J=\frac{1}{2}$) has been measured by a magnetic-resonance absorption method, with a water-vapor laser as the source oscillator. Corresponding magnetic dipole spectra are calculated from the data. A near overlap of the water line on one magnetic-dipole transition suggests a possible pumping mechanism for the 18-cm maser emission of stellar OH.
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