J/A+A/591/A110 15NH2 amidogen radical rotational spectrum (Margules+, 2016)
Terahertz spectroscopy of 15NH2 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 2016A&A...591A.110M (SIMBAD/NED BibCode)
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 14N/15N 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, NH2.
This work aimed at determining rotational frequencies of 15NH2 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 15NH2
species.
The first spectroscopic study of the 15N-isotopologue of the
amidogen radical yielded an accurate set of molecular parameters.
Accurate frequencies are now available for 15NH2 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 15NH2 and
files used for SPFIT.
Detailled explanations on SPFIT could be found at
https://www.astro.uni-koeln.de/cdms/pickett
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
s1.dat 83 876 Measured frequencies and residuals from the
global fit of the Infrared, and
submillimeter-wave data for 15NH2
s2.lin 80 876 .lin file, input file for SPFIT
s3.par 80 67 .par file, input file for SPFIT
s4.cat 83 9049 .cat prediction up to 7 THz
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See also:
J/A+A/493/565 : Deuterated and 15N ethyl cyanides (Margules+, 2009)
J/A+A/500/1109 : Rotational spectrum of HCOO13CH3 (Carvajal+, 2009)
J/A+A/538/A51 : Rotational spectrum of CH3CH(NH2)CN (Mollendal+, 2012)
J/A+A/538/A119 : Spectrum of 18O-methyl formate HCO18OCH3 (Tercero+ 2012)
J/A+A/540/A51 : Submm spectrum of deuterated glycolaldehydes (Bouchez+, 2012)
J/A+A/543/A46 : Submillimeter spectrum of HCOOCD2H (Coudert+, 2012)
J/A+A/543/A135 : New analysis of 13C-CH3CH2CN up to 1THz (Richard+, 2012)
J/A+A/544/A82 : Rotational spectroscopy of diisocyanomethane (Motiyenko+ 2012)
J/A+A/548/A71 : Spectroscopy and ISM detection of formamide (Motiyenko+, 2012)
J/A+A/549/A96 : mm and sub-mm spectra of 13C-glycolaldehydes (Haykal+, 2013)
J/A+A/549/A128 : Singly deuterated isotopologues of formamide (Kutsenko+, 2013)
J/A+A/552/A117 : Mono-deuterated dimethyl ether (Richard+, 2013)
J/A+A/553/A84 : (Sub)mm spectrum of deuterated methyl cyanides (Nguyen+, 2013)
J/A+A/559/A44 : Rotational spectrum of MAAN (CH2NCH2CN) (Motiyenko+, 2013)
J/A+A/563/A137 : THz spectrum of methylamine (Motiyenko+, 2014)
J/A+A/568/A58 : HCOO13CH3 rotational spectrum (Haykal+, 2014)
J/A+A/579/A46 : Mono13C acetaldehydes mm/submm wave spectra (Margules+ 2015)
Byte-by-byte Description of file: s1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- N" Upper N quantum number
4- 5 I2 --- Ka" Upper Ka quantum number
7- 8 I2 --- Kc" Upper Kc quantum number
10- 11 I2 --- J" Upper Kc quantum number
13- 14 I2 --- F"1 Upper Kc quantum number
17 I1 --- I"H Upper Kc quantum number
19- 20 I2 --- F" Upper Kc quantum number
22- 23 I2 --- N' Upper N quantum number
25- 26 I2 --- Ka' Upper Ka quantum number
28- 29 I2 --- Kc' Upper Kc quantum number
31- 32 I2 --- J' Upper Kc quantum number
34- 35 I2 --- F'1 Upper Kc quantum number
38 I1 --- I'H Upper Kc quantum number
40- 41 I2 --- F' Upper Kc quantum number
44- 56 F13.6 --- Freq Observed transition frequency (1)
59- 66 F8.5 --- unc Uncertainty of measurements (1)
68- 71 A4 --- x_Freq Unit of frequency and unc (MHz or cm-1) (1)
74- 83 F10.7 --- WT relative weight of line within a blend
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Note (1): From line 1 to 76 : units are MHz, from 77 to 876 units are cm-1
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Description of file:
File s2.lin (measured transition):
------------------------------------------------------------------------------
Bytes Format Units Label Explanations
------------------------------------------------------------------------------
2- 3 I2 --- N" Upper N quantum number
5- 6 I2 --- Ka" Upper Ka quantum number
8- 9 I2 --- Kc" Upper Kc quantum number
11- 12 I2 --- J" Upper Kc quantum number
14- 15 I2 --- F"1 Upper Kc quantum number
18 I1 --- I"H Upper Kc quantum number
20- 21 I2 --- F" Upper Kc quantum number
23- 24 I2 --- N' Upper N quantum number
26- 27 I2 --- Ka' Upper Ka quantum number
29- 30 I2 --- Kc' Upper Kc quantum number
32- 33 I2 --- J' Upper Kc quantum number
35- 36 I2 --- F'1 Upper Kc quantum number
39 I1 --- I'H Upper Kc quantum number
41- 42 I2 --- F' Upper Kc quantum number
52- 64 F13.6 --- Freq Observed transition frequency (MHz or cm-1) (1)
67- 73 F7.5 --- unc Uncertainty of measurements (MHz or cm-1)(1)
75- 80 F6.3 --- O-C Observed - Calculated frequencies (MHz or cm-1)(1)
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Note (1): From line 1 to 76 : units are MHz, from 77 to 876 units are cm-1
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File s3.par (spectroscopic parameters):
First 3 lines for SFIPT use (see https://www.astro.uni-koeln.de/cdms/pickett)
For lines 4 to 67:
------------------------------------------------------------------------------
Bytes Format Units Label Explanations
------------------------------------------------------------------------------
4- 13 I10 --- IDPAR coding of the parameter
16- 37 E22.15 --- PAR parameter value
39- 52 E14.8 --- ERPAR parameter uncertainty
54- 64 A11 --- LABEL parameter label that is delimited by /
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File s4.cat (spectrum prevision):
------------------------------------------------------------------------------
Bytes Format Units Label Explanations
------------------------------------------------------------------------------
2- 13 F12.4 MHz FREQ Frequency of the line
14- 21 F8.4 MHz ERR Estimated or experimental error
23- 29 F7.4 --- LGINT Base 10 logarithm of the integrated intensity
in units of nm2 MHz
31 I1 --- DR Degrees of freedom in the rotational partition
function
33- 41 F9.4 --- ELO Lower state energy in wavenumbers
43- 44 I2 --- GUP Upper state degeneracy
47- 51 I5 --- TAG Species tag or molecular identifier
52- 55 I4 --- QNFMT Identifies the format of the quantum numbers
given in the field QN
56- 57 I2 --- N" Upper N quantum number
58- 59 I2 --- Ka" Upper Ka quantum number
60- 61 I2 --- Kc" Upper Kc quantum number
62- 63 I2 --- J" Upper Kc quantum number
64- 65 I2 --- F"1 Upper Kc quantum number
66- 67 I2 --- I"H Upper Kc quantum number
68- 69 I2 --- F" Upper Kc quantum number
70- 71 I2 --- N' Upper N quantum number
72- 73 I2 --- Ka' Upper Ka quantum number
74- 75 I2 --- Kc' Upper Kc quantum number
76- 77 I2 --- J' Upper Kc quantum number
78- 79 I2 --- F'1 Upper Kc quantum number
80- 81 I2 --- I'H Upper Kc quantum number
82- 83 I2 --- F' Upper Kc quantum number
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Acknowledgements:
Laurent Margules, laurent.margules(at)univ-lille1.fr
(End) Laurent Margules [Phlam, France], Patricia Vannier [CDS] 14-Apr-2016