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J/A+A/504/635   Dimethyl ether laboratory spectra up to 2.1THz   (Endres+, 2009)

Dimethyl ether: laboratory spectra up to 2.1 THz. Endres C.P., Drouin B.J., Pearson J.C., Muller H.S.P., Lewen F., Schlemmer S., Giesen T.F. <Astron. Astrophys. 504, 635 (2009)> =2009A&A...504..635E
ADC_Keywords: Atomic physics Keywords: ISM: molecules - molecular data - methods: laboratory - techniques: spectroscopic - radio lines: ISM - submillimeter Abstract: Dimethyl ether (CH3OCH3) is one of the largest organic molecules detected in the interstellar medium. As an asymmetric top molecule with two methyl groups which undergo large amplitude motions and a dipole moment of mub=1.3D it conveys a dense spectrum throughout the terahertz region and contributes to the spectral line confusion in astronomical observations at these frequencies. Rotational spectra of dimethyl ether in its ground vibrational states are presented in this paper, which have been measured in the laboratory and analyzed covering frequencies up to 2.1THz. The analysis is based on an effective Hamiltonian for a symmetric two-top rotor and includes experimental data published so far. Frequency predictions are presented up to 2.5THz for astronomical applications with accuracies better than 1MHz. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 57 6830 Assigned and fitted transition frequencies of dimethyl ether in the ground vibrational state
See also: J/ApJ/500/1059 : Dimethyl ether transitions frequencies (Groner+, 1998) Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 2 I2 --- t Torsional substates (1) 4- 5 I2 --- J' J' rotational quantum number 7- 8 I2 --- K'a K'a rotational quantum number 10- 11 I2 --- K'c K'c rotational quantum number 13- 14 I2 --- J" J" rotational quantum number 16- 17 I2 --- K"a K"a rotational quantum number 19- 20 I2 --- K"c K"c rotational quantum number 22- 32 F11.3 MHz Freq Frequency 34- 38 F5.3 MHz e_Freq rms uncertainty on Freq 40- 45 F6.3 MHz O-C Observed minus calculated frequency 47- 57 A11 --- Source Source (2)
Note (1): Torsional substates are: 00 = AA 01 = EE 11 = AE 12 = EA Note (2): Sources as follows: Lovas = Lovas et al. 1979, J. Phys. Chem. Ref. Data 8, 1051 Durig = Durig et al. 1976, J. Molec. Spectrosc. 62, 159 Neustock = Neustock et al. 1990, Z. Naturforsch. 45a, 702 Niide = Niide et al. 2003, J. Molec. Spectrosc. 220, 65 Klystron = Groner et al. 1998, Cat. J/ApJ/500/1059 klystron-based measurements FASSST = Groner et al. 1998, Cat. J/ApJ/500/1059 FASSST-based measurements BWO = this work, BWO-based measurements done in Cologne BWO_SL = this work, BWO + Superlattice multiplier based measurements done in Cologne Synthesizer = this work, Synthesizer-based measurements done in Cologne JPL = this work, Multiplier chain-based measurements done at JPL
Acknowledgements: C.P. Endres, endres(at)ph1.uni-koeln.de
(End) Patricia Vannier [CDS] 03-Jul-2009
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