The proposed identification of the triplet of interstellar lines recently discovered at 93.174 GHz with the molecular ion N2H(+) is confirmed by resolving the predicted hyperfine structure of the inner nitrogen nucleus in the narrow-line molecular source OMC-2 in the Orion Nebula. The hyperfine constants of N2H(+) are derived from the observational data, and the rest center frequency of the J = 1-0 rotational transition is determined. It is noted that the full width at half-maximum of the weakest line (F₁ = 0-1) is only 230 kHz (0.74 km/sec in radial velocity), making it the narrowest molecular emission line (excluding maser point sources) thus far observed in the direction of a H II region or IR source.
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Thaddeus et al. (1975) studied this question.