IMPROVED DETERMINATION OF THE 10–00 ROTATIONAL FREQUENCY OF NH3D+ FROM THE HIGH-RESOLUTION SPECTRUM OF THE ν4 INFRARED BAND

The high-resolution spectrum of the ν4 band of NH3D+ has been measured by difference frequency IR laser spectroscopy in a multipass hollow cathode discharge cell. From the set of molecular constants obtained from the analysis of the spectrum, a value of 262817 ± 6 MHz (±3σ) has been derived for the frequency of the 10–00 rotational transition. This value supports the assignment to NH3D+ of lines at 262816.7 MHz recorded in radio astronomy observations in Orion-IRc2 and the cold prestellar core B1-bS.

[1]  A. Fuente,et al.  DETECTION OF THE AMMONIUM ION IN SPACE , 2013, 1306.3364.

[2]  J. Cernicharo,et al.  Proton transfer chains in cold plasmas of H2 with small amounts of N2. The prevalence of NH4(+). , 2013, Physical chemistry chemical physics : PCCP.

[3]  S. Maret,et al.  Nitrogen hydrides and the H2 ortho-to-para ratio in dark clouds , 2011, 1111.1572.

[4]  V. Herrero,et al.  Neutral and ion chemistry in low pressure dc plasmas of H2/N2 mixtures: routes for the efficient production of NH3 and NH4(+). , 2011, Physical chemistry chemical physics : PCCP.

[5]  R. Garrod,et al.  Hydrodynamical-Chemical Models from Prestellar Cores to Protostellar Cores , 2011, Proceedings of the International Astronomical Union.

[6]  A. Tielens.  The Molecular Universe , 2011, Proceedings of the International Astronomical Union.

[7]  V. Herrero,et al.  Isotopic exchange processes in cold plasmas of H2/D2 mixtures. , 2011, Physical chemistry chemical physics : PCCP.

[8]  V. Wakelam,et al.  A NEW NETWORK FOR HIGHER-TEMPERATURE GAS-PHASE CHEMISTRY. I. A PRELIMINARY STUDY OF ACCRETION DISKS IN ACTIVE GALACTIC NUCLEI , 2010 .

[9]  D. Bohme,et al.  Ions in space. , 2007, Mass spectrometry reviews.

[10]  Takeshi Oka,et al.  Interstellar H3+ , 2006, Proceedings of the National Academy of Sciences.

[11]  M. Gerin,et al.  Interstellar deuterated ammonia : from NH3 to ND3 , 2005, astro-ph/0504445.

[12]  T. Quinn.  Practical realization of the definition of the metre, including recommended radiations of other optical frequency standards (2001) , 2003 .

[13]  S. Charnley,et al.  Chemical Evolution in Protostellar Envelopes: Cocoon Chemistry , 2003 .

[14]  Maryvonne Gerin,et al.  Detection of Triply Deuterated Ammonia in the Barnard 1 Cloud , 2002 .

[15]  E. P. Hunter,et al.  Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update , 1998 .

[16]  A. Lichtenberg,et al.  Principles of Plasma Discharges and Materials Processing , 1994 .

[17]  Concepcion M. Domingo,et al.  New very sensitive double modulation techniques for the detection of high-resolution infrared absorption spectra of radicals, molecular ions, and excited states of stable molecules , 1994, Photonics West - Lasers and Applications in Science and Engineering.

[18]  David A. Williams,et al.  Dynamical models of molecular clouds: nitrogen chemistry , 1990 .

[19]  E. Herbst.  The chemistry of interstellar space , 1990 .

[20]  A. Pine.  Doppler-limited molecular spectroscopy by difference-frequency mixing* , 1974 .

[21]  Eric Herbst,et al.  The formation and depletion of molecules in dense interstellar clouds , 1973 .

[22]  William D. Watson,et al.  The Rate of Formation of Interstellar Molecules by Ion-Molecule Reactions , 1973 .

[23]  D. Papoušek,et al.  Molecular vibrational-rotational spectra , 1982 .