J/ApJS/209/23 Aminoacetonitrile transition frequencies (Motoki+, 2013)
Submillimeter-wave spectrum of aminoacetonitrile and its deuterated
isotopologues, possible precursors of the simplest amino acid glycine.
Motoki Y., Tsunoda Y., Ozeki H., Kobayashi K.
<Astrophys. J. Suppl. Ser., 209, 23 (2013)>
=2013ApJS..209...23M 2013ApJS..209...23M
ADC_Keywords: Spectra, millimetric/submm ; Atomic physics
Keywords: ISM: molecules - line: identification - molecular data -
submillimeter: ISM - techniques: spectroscopic
Abstract:
Aminoacetonitrile, NH2-CH2_-CN, has been considered one of the
important precursors of glycine, the simplest amino acid, and was
identified in Sgr B2(N) by Belloche et al. (2008, Cat. J/A+A/482/179)
based on their reanalysis of previous laboratory measurements.
However, these laboratory measurements were limited to the 1mm
wavelength region even for the normal species, and recent new radio
telescopes like ALMA require rest frequencies in a higher frequency
range. Therefore, we have extended the pure rotational spectra of
aminoacetonitrile and its amino-hydrogen-deuterated isotopologues
(NHDCH2CN and ND2CH2CN) up to 1.2THz and 0.6THz, respectively.
Belloche et al. indicated that the normal species may have been
misassigned in a previous microwave study by Bogey et al.
(1990JMoSp.143..180B 1990JMoSp.143..180B). We found that two more b-type spectral
transitions were misassigned, and all b-type transition frequencies
above Ka=2 had to be remeasured. For isotopologues, spectra above 40
GHz were observed for the first time and higher order centrifugal
distortion constants have been determined. The extension of the
measurements helped improve the molecular constants. The errors in the
frequency catalog data of normal and deuterated isotopologues are on
the order of 100kHz up to 1.2THz and 0.6THz, respectively, which are
precise enough for the future astronomical observations.
Description:
Millimeter- and submillimeter-wave spectra of aminoacetonitrile were
recorded in the frequency range 124-1200GHz with the
frequency-modulated spectrometer at Toho University.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 57 1754 Transition frequencies of aminoacetonitrile
(NH2-CH2-CN) and its deuterated forms
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See also:
J/A+A/482/179 : Interferometric study of SgrB2(N) (Belloche+, 2008)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Iso Isotopologue (1)
10- 11 I2 --- J' [1/82] The upper J quantum number
13- 14 I2 --- Ka' [0/23] The upper Ka quantum number
16- 17 I2 --- Kc' [0/74] The upper Kc quantum number
19- 20 I2 --- J" [0/81] The lower J quantum number
22- 23 I2 --- Ka" [0/22] The lower Ka quantum number
25- 26 I2 --- Kc" [0/74] The lower Kc quantum number
28- 38 F11.3 MHz Freq [8820/1200905] The experimental rest frequency
40- 44 F5.3 MHz e_Freq [0.03/2] Uncertainty in Freq
46- 51 F6.3 MHz O-C [-1.6/2.3] The observed minus calculated value
53- 57 A5 --- Ref Data reference (2)
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Note (1): Isotopologue as follows:
NH2CH2CN = Aminoacetonitrile;
NHDCH2CN = Mono-Deuterated Aminoacetonitrile;
ND2CH2CN = Doubly-Deuterated Aminoacetonitrile .
Note (2): Reference as follows:
MOT13 = This study.
PIK73 = Pickett, H. M., 1973, J. Mol. Spectrosc., 46, 335
(1973JMoSp..46..335P 1973JMoSp..46..335P).
MT72 = MacDonald, J. N., & Tyler, J. K. 1972, J. Chem. Soc.
Chem. Comm., 995.
BRO77 = Brown, R. D., Godfrey, P. D., Ottrey, A. L., &
Storey, J. W. V., 1977, J. Mol. Spectrosc., 68, 359
(1977JMoSp..68..359B 1977JMoSp..68..359B).
BOG90 = Bogey, M., Dubus, H., & Guillemin, J. C.,1990, J. Mol.
Spectrosc., 143, 180 (1990JMoSp.143..180B 1990JMoSp.143..180B).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 15-Jan-2014