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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 (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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 79 1852 Observed transition frequencies of aminoacetonitrile (NH2CH2CN)
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
Bytes Format Units Label Explanations
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)
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.
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 07-Aug-2017
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