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Title:Laboratory Characterization And Astronomical Detection Of The Nitrosylium Ion, No+
Author(s):Bailleux, Stephane
Contributor(s):Lefloch, Bertrand; Marcelino, Nuria; Treviño-Morales, Sandra; Gerin, Maryvonne; Roueff, Evelyne; Bachiller, Rafael; Fuente, Asuncion; Tercero, Belén; Cernicharo, Jose; Alekseev, E.A.
Subject(s):Mini-symposium: Astronomical Molecular Spectroscopy in the Age of ALMA
Abstract:We report the discovery for the first time in space of the nitrosylium ion, NO$^+$. The observations were performed towards the cold dense core Barnard 1-b. The identification of the $J$ = 2 $\leftarrow$ 1 line is supported by new laboratory measurements of rotational lines of NO$^+$ in the ground vibrational state up to the $J$ = 8 $\leftarrow$ 7 transition (953207.189 MHz). The ion was produced in a magnetically extended negative glow discharge in NO. Vibrational excitation of the ion was high enough to measure rotational lines up to $v$ = 2. A few transitions of $^{15}$NO$^+$ were also measured ($v = 0, 1$). All known rotational and ro-vibrational frequencies of this close-shell ion were included in an isotopically invariant analysis. In Barnard 1-b, the observed line profile of NO$^+$ exhibits two velocity components at 6.5 and 7.5 km s$^{-1}$, with column densities of 1.5$\times$10$^{12}$ and 6.5$\times$10$^{11}$ cm$^{-2}$, respectively. New observations of NO and HNO have been performed and allowed to estimate the following abundance ratios: $X$(NO)/$X$(NO$^+$) $\approx$ 511, and $X$(HNO)/$X$(NO$^+$) $\approx$ 1. The chemistry of NO$^+$ has been investigated by means of a time-dependent gas phase model which includes an updated chemical network according to recent experimental studies. The predicted abundance for NO$^+$ and NO is found to be consistent with the observations. However, that of HNO relative to NO is too high. No satisfactory chemical paths have been found to explain the observed low abundance of HNO.
Issue Date:2014-06-18
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:Bailleux, S.; Lefloch, B.; Marcelino, N.; Treviño-Morales, S.; Gerin, M.; Roueff, E.; Bachiller, R.; Fuente, A.; Tercero, B.; Cernicharo, J.; Alekseev, E.A. LABORATORY CHARACTERIZATION AND ASTRONOMICAL DETECTION OF THE NITROSYLIUM ION, NO+. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.WF06
Rights Information:Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License.
Date Available in IDEALS:2014-09-17

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