# First detection of NHD and ND2 in the interstellar medium

@article{Melosso2020FirstDO,
title={First detection of NHD and ND2 in the interstellar medium},
author={Mattia Melosso and Luca Bizzocchi and O. Sipil{\"a} and Barbara Michela Giuliano and Luca Dore and F Tamassia and Marie-Aline Martin-Drumel and Olivier Pirali and Elena Redaelli and Paola Caselli},
journal={arXiv: Astrophysics of Galaxies},
year={2020}
}
Deuterium fractionation processes in the interstellar medium (ISM) have been shown to be highly efficient in the family of nitrogen hydrides. To date, observations were limited to ammonia (NH$_2$D, NHD$_2$, ND$_3$) and imidogen radical (ND) isotopologues. We want to explore the high frequency windows offered by the \emph{Herschel Space Observatory} to search for deuterated forms of amidogen radical NH$_2$ and to compare the observations against the predictions of our comprehensive gas-grain… Expand

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#### References

SHOWING 1-10 OF 43 REFERENCES
• ASP Conf. Ser.
• 2010
The Herschel Data Processing System - HIPE and Pipelines - Up and Running Since the Start of the Mission
• Physics, Computer Science
• 2010
The scope, the management and development methodology of the Herschel Data Processing system is summarized, some key software elements are presented and an overview about the current status and future development milestones is given. Expand
Atomic deuterium/hydrogen in the Galaxy
An accurate value of the D/H ratio in the local interstellar medium (LISM) and a better understanding of the D/H variations with position in the Galactic disk and halo are vitally important questionsExpand
Deuterium hyperfine splittings in the rotational spectrum of NH2D as revealed by Lamb-dip spectroscopy
• Physics
• 2020
Abstract In the context of radio-astronomical observations, laboratory experiments constitute a cornerstone in the interpretation of rich line surveys due to the concomitant presence of numerousExpand
Submillimeter and Far-infrared Spectroscopy of Monodeuterated Amidogen Radical (NHD): Improved Rest Frequencies for Astrophysical Observations
Observations of ammonia in interstellar environments have revealed high levels of deuteration, and all its D-containing variants, including ND$_3$, have been detected in cold prestellar cores andExpand
Modeling deuterium chemistry in starless cores: full scrambling versus proton hop
• Physics, Chemistry
• Astronomy & Astrophysics
• 2019
We constructed two new models for deuterium and spin-state chemistry for the purpose of modeling the low-temperature environment prevailing in starless and pre-stellar cores. The fundamentalExpand
The pure rotational spectrum of 15ND2 observed by millimetre and submillimetre-wave spectroscopy.
Abstract The pure rotational spectrum of the amidogen radical 15ND2 has been observed between 264 and 1051 GHz with a source-modulation millimetre- and submillimetre-wave spectrometer. A total of 346Expand
The rotational spectrum of 15ND. Isotopic-independent Dunham-type analysis of the imidogen radical.
• Physics, Medicine
• Physical chemistry chemical physics : PCCP
• 2019
The rotational spectrum of 15ND in its ground electronic X3Σ- state has been observed for the first time and the Born-Oppenheimer equilibrium bond distance for the imidogen radical has been calculated and zero-point energies have been derived for all the isotopologues. Expand
Why does ammonia not freeze out in the center of pre-stellar cores?
• Physics
• 2019
We carried out a parameter-space exploration of the ammonia abundance in the pre-stellar core L1544, where it has been observed to increase toward the center of the core with no signs of freeze-outExpand
Detection of Interstellar Ortho-D2H+ with SOFIA
We report on the detection of the ground-state rotational line of ortho-D2H+ at 1.477 THz (203 micron) using the German REceiver for Astronomy at Terahertz frequencies (GREAT) onboard theExpand