J/ApJS/233/15 ND2 rotational spectrum (Melosso+, 2017)
Terahertz spectroscopy and global analysis of the rotational spectrum of doubly
deuterated amidogen radical ND2.
Melosso M., Degli Esposti C., Dore L.
<Astrophys. J. Suppl. Ser., 233, 15 (2017)>
=2017ApJS..233...15M 2017ApJS..233...15M
ADC_Keywords: Atomic physics ; Spectra, millimetric/submm ; Molecular data
Keywords: astrochemistry; ISM: molecules; methods: laboratory: molecular;
molecular data; techniques: spectroscopic
Abstract:
The deuteration mechanism of molecules in the interstellar medium is
still being debated. Observations of deuterium-bearing species in
several astronomical sources represent a powerful tool to improve our
understanding of the interstellar chemistry. The doubly deuterated
form of the astrophysically interesting amidogen radical could be a
target of detection in space. In this work, the rotational spectrum of
the ND2 radical in its ground vibrational and electronic X2B1
state has been investigated between 588 and 1131GHz using a frequency
modulation millimeter/submillimeter-wave spectrometer. The ND2
molecule has been produced in a free-space glass absorption cell by
discharging a mixture of ND3 and Ar. Sixty-four new transition
frequencies involving J values from 2 to 5 and Ka values from 0 to 4
have been measured. A global analysis including all the previous
field-free pure rotational data has been performed, allowing for a
more precise determination of a very large number of spectroscopic
parameters. Accurate predictions of rotational transition frequencies
of ND2 are now available from a few gigahertz up to several
terahertz.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 79 932 Observed transition frequencies of ND2
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Description of file: apjsaa9220.tar.gz in the FTP section provides the
files used with the SPFIT/SPCAT program suite. There are 8 files of
supplementary material, including a ReadMe, which was created by the
AAS data editors.
The text files are as follows:
1_Explan.txt = information on the content of the other files.
2ND2.fit = the output file of the fit of spectroscopic data used in
the present study.
3ND2.lin = the corresponding line file.
4ND2.par = the corresponding parameter file.
5ND2.cat = the output file of the prediction made with the parameters
determined in this study.
6ND2.var = the corresponding parameter file
7ND2.int = the corresponding intensity file
See also:
J/ApJ/820/L26 : J=1-0 transitions of argonium (ArH+) (Bizzocchi+, 2016)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Nup [1/13] Upper N quantum number
5- 6 I2 --- Kaup [0/10] Upper Ka quantum number
8- 9 I2 --- Kcup [0/12] Upper Kc quantum number
11- 12 I2 --- Jup [1/14] Upper J quantum number
14- 14 I1 --- F1up [1/9]? Upper F1 quantum number (1)
16- 16 I1 --- IDup [0/2]? Upper ID quantum number (1)
18- 19 I2 --- Fup [1/11]? Upper F quantum number (1)
21- 22 I2 --- Nlo [0/12] Lower N quantum number
24- 24 I1 --- Kalo [0/9] Lower Ka quantum number
26- 27 I2 --- Kclo [0/11] Lower Kc quantum number
29- 30 I2 --- Jlo [1/13] Lower J quantum number
32- 33 I2 --- F1lo [1/10]? Lower F1 quantum number (1)
35- 35 I1 --- IDlo [0/2]? Lower ID quantum number (1)
37- 38 I2 --- Flo [1/12]? Lower F quantum number (1)
40- 52 F13.5 MHz Freq [102.5/1131081] Experimental rest frequency (2)
54- 59 F6.4 MHz e_Freq [0.0007/1] Estimated uncertainties of
the rest frequency (2)
61- 68 F8.5 MHz O-C [-1.3/1.4] Observed minus calculated value (2)
70- 75 F6.4 --- Weight [0.0002/1]? Relative weight for blended lines
77- 79 A3 --- Ref Reference (3)
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Note (1): Not indicated if hyperfine structure is not resolved (value is blank).
Note (2): Units are in cm-1 for transitions from reference (d)
Note (3): References as follows:
(a) = Cook et al. (1983JChPh..78.2144C 1983JChPh..78.2144C);
(b) = Kanada et al. (1991JChPh..94.3423K 1991JChPh..94.3423K);
(c) = This work;
(d) = Morino et al. (1997JMoSp.182..428M 1997JMoSp.182..428M).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 10-Jan-2018