The far-infrared spectrum of the ¹⁴NH radical in its X³Σ⁻ state

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• 作者：Flores-Mijangos ; Jesú ; s ; Brown ; John M. ; Matsushima ; Fusakazu ; Odashima ; Hitoshi ; Takagi ; Kojiro ; et. al.
• 刊名：Journal of Molecular Spectroscopy
• 出版年：2004
• 出版时间：June, 2004
• 年：2004
• 卷：225
• 期：2
• 页码：189-195
• 全文大小：179 K

文摘

Pure rotational transitions of the ¹⁴NH radical in the v=0 level of the X³Σ⁻ ground state have been detected using tunable far-infrared radiation generated by third-order mixing of radiation from two CO₂ lasers with that from a microwave source. The NH radical was formed in a cooled dc electric discharge through ammonia gas in helium. The rotational transitions from N=1–0 up to 5–4 inclusive were detected. The nuclear hyperfine splittings become progressively less well resolved as N increases. These measurements have been combined with previous, more accurate measurements of the N=1–0 transition [Astron. Astrophys. 322 (1997) L1] to determine an improved set of molecular parameters for ¹⁴NH.