J/ApJS/233/15             ND_2_ rotational spectrum             (Melosso+, 2017)
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Terahertz spectroscopy and global analysis of the rotational spectrum of doubly
deuterated amidogen radical ND_2_.
    Melosso M., Degli Esposti C., Dore L.
   <Astrophys. J. Suppl. Ser., 233, 15 (2017)>
   =2017ApJS..233...15M
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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 ND_2_ radical in its ground vibrational and electronic X^2^B_1_
    state has been investigated between 588 and 1131GHz using a frequency
    modulation millimeter/submillimeter-wave spectrometer. The ND_2_
    molecule has been produced in a free-space glass absorption cell by
    discharging a mixture of ND_3_ and Ar. Sixty-four new transition
    frequencies involving J values from 2 to 5 and K_a_ 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 ND_2_ 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 ND_2_
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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.
  2_ND_2.fit   = the output file of the fit of spectroscopic data used in
                  the present study.
  3_ND_2.lin   = the corresponding line file.
  4_ND_2.par   = the corresponding parameter file.
  5_ND_2.cat   = the output file of the prediction made with the parameters
                  determined in this study.
  6_ND_2.var   = the corresponding parameter file
  7_ND_2.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);
    (b) = Kanada et al. (1991JChPh..94.3423K);
    (c) = This work;
    (d) = Morino et al. (1997JMoSp.182..428M).
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History:
    From electronic version of the journal

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(End)                  Prepared by [AAS], Emmanuelle Perret [CDS]    10-Jan-2018