Accurate Laboratory Measurement of the Complete Fine Structure of the N = 1 − 0 Transition of 15NH
| Autor: | S. Spezzano, Luca Dore, Jacob C. Laas, Filippo Tamassia, Mattia Melosso, Luca Bizzocchi, P. Caselli, Christian P. Endres, Barbara M. Giuliano, D. Prudenzano, Claudio Degli Esposti, Valerio Lattanzi |
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| Přispěvatelé: | Bizzocchi, Luca, Melosso, Mattia, Dore, Luca, Esposti, Claudio Degli, Tamassia, Filippo, Prudenzano, Domenico, Lattanzi, Valerio, Laas, Jacob, Spezzano, Silvia, Giuliano, Barbara M., Endres, Christian P., Caselli, Paola |
| Rok vydání: | 2018 |
| Předmět: |
Physics
010504 meteorology & atmospheric sciences Condensed matter physics Structure (category theory) methods: laboratory: molecular Astronomy and Astrophysics ISM: molecule Astronomy and Astrophysic 01 natural sciences Space and Planetary Science 0103 physical sciences 010303 astronomy & astrophysics techniques: spectroscopic 0105 earth and related environmental sciences |
| Zdroj: | The Astrophysical Journal. 863:3 |
| ISSN: | 1538-4357 |
| DOI: | 10.3847/1538-4357/aacffc |
| Popis: | The imidogen radical is an important molecule of the chemistry of nitrogen in the interstellar medium and is thought to be a key intermediate in the gas-phase synthesis of ammonia. The full fine structure of the N = 1 ← 0 rotational transition of 15NH has been observed for the first time by pure rotational spectroscopy around 1 THz. The radical has been produced by means of low-pressure glow discharge of H2 and 15N-enriched nitrogen. A number of hyperfine components have been observed and accurately measured. The analysis of the data provided very precise spectroscopic constants, which include rotational, centrifugal distortion, electron spin-spin interaction, and electron spin-rotation terms in addition to the hyperfine parameters relative to the isotropic and anisotropic electron spin-nuclear spin interactions for 15N and H and to the nuclear spin-rotation for 15N. The efficiency of the discharge system allowed us to observe several components of the same rotational transition in the excited vibrational state v=1, for which a set of spectroscopic constants has also been determined. |
| Databáze: | OpenAIRE |
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