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J/A+A/591/A110 ^15^NH_2_ amidogen radical rotational spectrum (Margules+, 2016)
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Terahertz spectroscopy of ^15^NH_2_ amidogen radical.
Margules L., Martin-Drumel M.A., Pirali O., Bailleux S., Wlodarczak G.,
Roy P., Roueff E., Gerin M.
<Astron. Astrophys. 591, A110 (2016)>
=2016A&A...591A.110M (SIMBAD/NED BibCode)
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ADC_Keywords: Atomic physics
Keywords: submillimeter: ISM - line: identification -
astronomical databases: miscellaneous - ISM: molecules
Abstract:
The determination of isotopic ratios in interstellar molecules is a
powerful probe of chemical routes leading to their formation. In
particular the ^14^N/^15^N abundance ratio of nitrogen-bearing
species provides information on possible fractionation mechanisms. Up
to now there is no accurate determination of this ratio in the ISM for
the amidogen radical, NH_2_.
This work aimed at determining rotational frequencies of ^15^NH_2_ in
order to enable its astronomical detection, which will help to
understand the formation mechanisms of nitrogen hydrides in the ISM.
Complementary synchrotron-based broadband far-infrared and high
resolution submillimeter-wave frequency measurements have been
performed to investigate the pure rotational spectrum of the ^15^NH_2_
species.
The first spectroscopic study of the ^15^N-isotopologue of the
amidogen radical yielded an accurate set of molecular parameters.
Accurate frequencies are now available for ^15^NH_2_ up to 7THz (with
N''>=13) and dedicated astronomical searches can be undertaken.
Description:
Measured frequencies and residuals from the global fit of the
Infrared, and submillimeter-wave data for ^15^NH_2_ and
files used for SPFIT.
Detailled explanations on SPFIT could be found at
https://www.astro.uni-koeln.de/cdms/pickett