On the Detection of Imidogen, NH, in the Interstellar Medium

One and two transitions of the A ³Π – X ³Σ electronic spectrum of imidogen near 335 nm were detected in diffuse clouds toward ζ Per and HD 27778, respectively:
D. M. Meyer and K. C. Roth,
Discovery of Interstellar NH
Astrophys. J. 376, L49–L52 (1991).

The detection of one fine struture component of the N = 2 – 1 pure rotational transition toward Sgr B2 was reported by
J. Cernicharo, J. R. Goicoechea, and E. Caux,
Far-Infrared Detection of C₃ in Sagittarius B2 and IRC +10216
Astrophys. J. 534, L199–L202 (2000);
a second fine structure component of that transition was reported in
J. R. Goicoechea, N. J. Rodríguez-Fernández and J. Cernicharo,
The Far-Infrared Spectrum of the Sagittarius B2 Region:
Extended Molecular Absorption, Photodissociation, and Photoionization
Astrophys. J. 600, 214–233 (2004).