2024-03-29T11:19:58Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1178252022-10-10T10:56:29Zcom_10261_44com_10261_4com_10261_135col_10261_423col_10261_514
Cueto, Maite
Doménech, José Luis
Herrero, Víctor J.
Tanarro, Isabel
Cernicharo, José
Tercero, Belén
Fuente, Asunción
2015-07-10T10:52:13Z
2015-07-10T10:52:13Z
2014-01-22
VI Jornadas Jóvenes Investigadores en Física Atómica y Molecular (2014)
http://hdl.handle.net/10261/117825
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 (±3¿). 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 the¿¿4 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 (±3¿) 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).
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First detection of the ammonium ion in space supported by an improved determination of the 10-00 rotational frequency of NH3D+ from the nu4 infrared band
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