C.D.S. - SIMBAD4 rel 1.7 - 2020.02.21CET09:34:51

2008ApJ...673.1240A - Astrophys. J., 673, 1240-1248 (2008/February-1)

The rotational spectrum of anti-ethylamine (CH3CH2NH2) from 10 to 270 GHz: a laboratory study and astronomical search in Sgr B2(N).


Abstract (from CDS):

The pure rotational spectrum of the lowest energy (anti-) conformer of ethylamine (CH3CH2NH2) has been measured in the frequency range of 10-270 GHz. The spectrum was recorded using both millimeter-wave absorption spectroscopy and Fourier transform microwave (FTMW) techniques. Ten rotational transitions of this molecule were recorded in the frequency range of 10-40 GHz using FTMW methods, resulting in the assignment of 53 quadrupole-resolved hyperfine lines; in the millimeter-wave region (48-270 GHz), nearly 600 transitions were assigned to the ground (anti-) state. The amine group in CH3CH2NH2 undergoes inversion, resulting in a doubling that is frequently small and most apparent in the low-frequency K-doubling transitions. In addition, seemingly random rotational levels of this molecule were found to be significantly perturbed. The cause of these perturbations is presently uncertain, but torsion-rotation interactions with the higher lying gauche conformers seem to be a likely explanation. An astronomical search was conducted for ethylamine toward Sgr B2(N) using the Kitt Peak 12 m antenna and the Sub-Millimeter Telescope (SMT) of the Arizona Radio Observatory. Frequencies of 70 favorable rotational transitions were observed in this search, which covered the range 68-263 GHz. Ethylamine was not conclusively detected in Sgr B2(N), with an upper limit to the column density of (1-8)x1013/cm2 with f(CH3CH2NH2/H2)~(0.3-3)x10–11, assuming a rotational temperature of 50-220 K. These observations indicate a gas-phase CH3CH2NH2/CH3NH2 ratio of <0.001-0.01, in contrast to the nearly equal ratio suggested by the acid hydrolysis of cometary solids from the Stardust mission.

Abstract Copyright:

Journal keyword(s): Astrobiology - Astrochemistry - ISM: Abundances - ISM: Individual: Name: Sagittarius B2 - ISM: Molecules - Line: Identification - Methods: Laboratory

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 1968 1
2 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 504 1
3 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1879 1

    Equat.    Gal    SGal    Ecl

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