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Título: | First detection of the ammonium ion in space supported by an improved determination of the 10-00 rotational frequency of NH3D+ from the n4 infrared band |
Autor: | Cueto, Maite CSIC; Doménech, José Luis CSIC ORCID ; Herrero, Víctor J. CSIC ORCID; Tanarro, Isabel CSIC ORCID ; Cernicharo, José CSIC ORCID ; Fuente, Asunción CSIC ORCID | Fecha de publicación: | ene-2014 | Editor: | Universidad del País Vasco | Citación: | VI Jornadas de Jóvenes Investigadores en Física Atómica y Molecular | Resumen: | First detection of the ammonium ion in space supported by an improvement determination of the 10-00 rotational frequency of NH3D+ from the nu4 infrared band M. Cueto, J. L. Doménech, V. J. Herrero, I. Tanarro, J. Cernicharo, B. Tercero, A. Fuente The detection of a narrow and isolated feature at 262816.7 MHz toward the sources Orion-IRc2 and the cold prestellar core B1-bS has been recently reported [1]. The observations were performed with the IRAM 30 m radio telescope (Sierra Nevada, Spain). This emission line is very close to the predicted frequency [2] for the JK=10-00 line of the deuterated ammonium ion, NH3D+, 262807±9 MHz (±3σ). This deuterated species of the ammonium ion was first observed in the laboratory [2] through its 4 vibrational mode from which rotational constants for the ground state were derived. In our laboratory we have measured the high-resolution spectrum of the4 band of NH3D+ by difference frequency IR laser spectroscopy in a multipass hollow cathode discharge cell [3] . The main experimental improvement of our study is due to the availability of a more precise frequency scale and a more favorable ratio of precursors in the discharge. Based on our observations we propose a value of 262817±6 MHz (±3σ) for the frequency of the 10-00 pure rotational transition of NH3D+, in good agreement with that of the feature detected in Orion-IRc2 and B1-bS, thus supporting the identification of this molecular ion in the Interstellar Medium (ISM). | Descripción: | J2IFAM 2014 del 22 al 24 de enero de 2014 en el Campus de Leioa/Erandio de la Universdad del País Vasco (UPV/EHU) | URI: | http://hdl.handle.net/10261/105554 |
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Charla NH3D+_VI Jornadas Jóvenes.pdf | 2,89 MB | Adobe PDF | Visualizar/Abrir |
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