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J/ApJ/500/1059      Dimethyl ether transitions frequencies   (Groner+, 1998)

Dimethyl ether: laboratory assignments and predictions through 600 GHz. Groner P., Albert S., Herbst E., De Lucia F.C. <Astrophys. J. 500, 1059 (1998)> =1998ApJ...500.1059G (SIMBAD/NED BibCode)
ADC_Keywords: Interstellar medium ; Atomic physics Keywords: ISM: molecules - molecular data - molecular processes - radio lines: ISM Abstract: Dimethyl ether (CH3OCH3) is a well-known interstellar molecule with a large abundance in hot core regions. We have measured many rotational-torsional transition lines of this molecule in the 100-550GHz frequency range using two experimental techniques: a klystron-based traditional millimeter-wave spectrometer and a new fast scan spectrometer (designated "FASSST") with a voltage-tunable backward wave oscillator. The lines arising from the ground vibrational state have been combined with previous data, mainly at lower frequencies, to form a global data set consisting of over 1600 lines that have been assigned and fitted by an effective Hamiltonian method. The spectral constants obtained from the fit allow us to predict the frequencies of almost 6000 additional lines of dimethyl ether through 600GHz. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 47 2148 Assigned and Fitted Transition Frequencies of Dimethyl Ether in the Ground Vibrational State table3.dat 57 7546 Predicted Transition Frequencies of Dimethyl Ether in the Ground Vibrational State
See also: J/ApJ/499/517 : Ethylene oxide spectrum (Pan+, 1998) Byte-by-byte Description of file: table1.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- 31 F10.3 MHz Freq Frequency 33- 38 F6.3 MHz O-C Observed minus calculated frequency 40- 44 F5.3 MHz e_Freq ?=0.000 rms uncertainty on Freq (2) 46 A1 --- Source Source (3)
Note (1): 00=AA , 01=EE , 11=AE , 12=EA Note (2): A 0.000 in the uncertainties column signifies that the transition has been assigned but not included in the fit. Many of these are weaker, blended lines for which the measured frequency of the stronger neighbor was used to calculate the listed O - C. A total of 1626 assigned frequencies were used in the fit. Note (3): L: Lovas et al. 1979, J. Phys. Chem. Ref. Data 8, 1051 D: Durig et al. 1976, J. Molec. Spectrosc. 62, 159 N: Neustock et al. 1990, Z. Naturforsch. 45a, 702 K: this work, klystron-based measurements F: this work, FASSST-based measurements
Byte-by-byte Description of file: table3.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- 31 F10.3 MHz Freq Frequency 33- 37 F5.3 MHz e_Freq rms uncertainty on Freq 39- 40 I2 --- WSpin Spin weight 42- 49 F8.5 --- S S value (Townes & Schawlow, 1975, Microwave Spectroscopy (New York: Dover))) 51- 57 F7.3 cm-1 Eu Upper state energies
Note (1): Torsional substates: 00=AA , 01=EE , 11=AE , 12=EA
History: From ApJ electronic version
(End) James Marcout, Patricia Bauer [CDS] 09-Mar-1999
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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