J/ApJS/230/26 NH2CH2CN transition frequencies (Degli Esposti+, 2017)
Millimeter-wave and submillimeter-wave spectra of aminoacetonitrile in the
three lowest vibrational excited states.
Degli Esposti C., Dore L., Melosso M., Kobayashi K., Fujita C., Ozeki H.
<Astrophys. J. Suppl. Ser., 230, 26-26 (2017)>
=2017ApJS..230...26D 2017ApJS..230...26D (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics ; Spectra, millimetric/submm
Keywords: ISM: molecules; line: identification; molecular data;
submillimeter: ISM; techniques: spectroscopic
Abstract:
It is important to study possible precursors of amino acids such as
glycine to enable future searches in interstellar space.
Aminoacetonitrile (NH2CH2CN) is one of the most feasible molecules
for this purpose. This molecule was already detected toward Sgr B2(N).
Aminoacetonitrile has a few low-lying vibrational excited states, and
transitions within these states may be found in space. In this study,
the pure-rotational transitions in the three lowest vibrational states
in the 80-450 GHz range have been assigned and analyzed. It was found
to be very important to include Coriolis coupling between the two
lowest vibrational fundamentals, while the third one was unperturbed.
The partition function was evaluated considering these new results.
Description:
The present experiments were carried out in two laboratories, at
Bologna and Toho Universities, respectively.
The experiment at Bologna was conducted in the frequency ranges 80-115
and 240-290GHz using a source-modulation millimeter/submillimeter-wave
spectrometer.
The experiment at Toho University was conducted in frequency regions
complementary to those investigated in Bologna, reaching a frequency
as high as 450GHz, with essentially the same apparatus and experimental
conditions of the previous work (Motoki+ 2013, J/ApJS/209/23).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 79 1852 Observed transition frequencies of aminoacetonitrile
(NH2CH2CN)
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See also:
J/ApJS/209/23 : Aminoacetonitrile transition frequencies (Motoki+, 2013)
J/ApJS/229/26 : Rotational spectra of aminoacetonitrile (Kolesnikova+, 2017)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Jup [7/56] Upper J quantum number
5- 8 I4 --- Kaup [0/15] Upper Ka quantum number
9- 12 I4 --- Kcup [1/51] Upper Kc quantum number
13- 16 I4 --- Iup [0/2]? Upper I quantum number(1)
17- 20 I4 --- Fup [8/16]? Upper F quantum number(1)
21- 24 I4 --- Jlo [6/56] Lower J quantum number
25- 28 I4 --- Kalo [0/15] Lower Ka quantum number
29- 32 I4 --- Kclo [0/52] Lower Kc quantum number
33- 36 I4 --- Ilo [0/2]? Lower I quantum number (1)
37- 40 I4 --- Flo [7/15]? Lower F quantum number (1)
48- 57 F10.3 MHz Freq [80475/448350] Experimental rest frequency
59- 62 F4.3 MHz e_Freq [0.02/0.9] Estimated uncertainties
of the rest frequency
67- 71 F5.3 MHz O-C [-0.2/0.2] Observed minus calculated value
75- 79 A5 --- State Vibrational state of aminoacetonitrile (2)
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Note (1): Iup, Ilo, Fup and Flo are not indicated if hyperfine structure is not
resolved.
Note (2): This table contains results for the three lowest vibrational states
of aminoacetonitrile: v11=1, v17=1, v18=1.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 07-Aug-2017