Address of Cooksy, Hovde, Blake, and Saykally: Department of Chemistry, University of California, Berkeley, CA 94720Author Institution:Direct observation of the J=2β1 fine structure transition in 3PN+ and the J=3/2β1/2 transition in 2PC+ by far-infrared laser magnetic resonance spectroscopy has led to the precise evaluation of these fine structure splittings and corresponding gJβ-factors and hyperfine parameters. These values are expected to facilitate the observation and analysis of these transitions in the interstellar medium