J/A+A/558/A112 Dimethyl ether-13C lab spectra up to 1.5THz (Koerber+, 2013)
Laboratory rotational spectra of the dimethyl ether 13C-isotopologues
up to 1.5 THz.
Koerber M., Bisschop S.E., Endres C.P., Kleshcheva M., Pohl R.W.H.,
Klein A., Lewen F., Schlemmer S.
<Astron. Astrophys. 558, A112 (2013)>
=2013A&A...558A.112K 2013A&A...558A.112K
ADC_Keywords: Atomic physics
Keywords: molecular data - methods: laboratory - ISM: molecules -
ISM: abundances - astrochemistry
Description:
The interpretation of astronomical observations depends on the
knowledge of accurate rest frequencies and intensities. The objective
of this work is to provide spectroscopic data for the two
13C-isotopologues of dimethyl ether in the vibrational ground state.
High-resolution rotational-torsional spectra of dimethyl ether-13C1
and dimethyl ether-13C2 have been measured in the laboratory
covering frequencies up to 1.5THz. The analysis is based on an
effective rotational Hamiltonian for molecules with two large
amplitude motions.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 77 4530 Experimental transition frequencies of 12-13
dimethyl ether 12CH3O13CH3
table6.dat 73 3055 Experimental transition frequencies of 13-13
dimethyl ether 13CH3O13CH3
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Byte-by-byte Description of file: table5.dat table6.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- t Torsional substate (1)
6- 7 I2 --- J' [1/60] J quantum number upper transition state
10- 11 I2 --- Ka' [0/25] Ka quantum number upper transition state
14- 15 I2 --- Kc' [0/56] Kc quantum number upper transition state
18- 19 I2 --- J" [0/60] J quantum number lower transition state
22- 23 I2 --- Ka" [0/25] Ka quantum number lower transition state
26- 27 I2 --- Kc" [0/57] Kc quantum number lower transition state
30- 40 F11.3 MHz Freq [8739/1500000] Experimental transition frequency
43- 46 F4.2 --- blend [0/1] Relative weight of the transition in a blend
49- 52 F4.2 MHz e_Freq ? Experimental uncertainty of Freq
55- 61 F7.4 MHz O-C Observed minus calculated frequency
64- 70 F7.4 MHz O-Cw ? Weighted O-C for the whole set of blends
73- 77 A5 --- Note Details (2)
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Note (1): Torsional substates are labeled as σ1*σ2 which
correspond to (see Ohashi et al. (2004, J. Mol. Spectrosc., 227, 28)
for details):
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table5 | table 6
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00 = AA | 00 = AA
01 = AE | 01 = EE
10 = EA |
11 = EE | 11 = AE
1-1 = EE' | 1-1 = EA
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Note (2): Details as follows:
Niide = transitions are taken from Niide and Hayashi 2003, J. Mol.
Spectrosc. 220, 65
* = asymmetric rotor labelling of the transition is not clearly defined
since the Ka-doublets are degenerate and the labels frequently shift
in the fit due to numerical noise
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Acknowledgements:
MMonika Koerber, koerber(at)ph1.uni-koeln.de
I. Physikalisches Institut, University of Cologne
(End) M. Koerber [I. Phys. Inst., Univ. Cologne], P. Vannier [CDS] 03-Sep-2013