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J/ApJ/499/517       Ethylene oxide spectrum                  (Pan+, 1998)

The millimeter- and submillimeter-wave spectrum of ethylene oxide (c-C2H4O) Pan J., Albert S., Sastry K.V.L.N., Herbst E., De Lucia F.C. <Astrophys. J. 499, 517 (1998)> =1998ApJ...499..517P (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics ; Spectroscopy Keywords: ISM: molecules - methods: laboratory - molecular data - radio lines: ISM Abstract: The cyclic molecule ethylene oxide (c-C2H4O) has recently been detected in the interstellar source Sgr B2N. Previous laboratory work on the rotational spectrum of this molecule extends only to a frequency of 123GHz. We report here the extension of the laboratory rotational spectrum of this species through the frequency range 262358GHz using a new fast scan spectrometer (fast scan submillimeter spectroscopic technique, FASSST). The newly measured lines have been combined with previous data at lower frequencies to form a data set consisting of 662 lines that has been assigned and fitted via a standard semirigid asymmetric top analysis. The spectral constants obtained from the fit have allowed us to predict the frequencies of many additional lines. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 52 662 Assigned and fitted transition frequencies of Ethylene oxide in the ground vibrational state table3.dat 48 1117 Predicted transition frequencies of ethylene oxide in the ground vibrational state
See also: J/ApJS/117/427 : Sgr B2 spectral survey (Nummelin+, 1998) J/ApJ/500/1059 : Dimethyl ether transitions frequencies (Groner+, 1998) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 2 I2 --- J' J' rotational quantum number 4- 5 I2 --- K'a K'a rotational quantum number 7- 8 I2 --- K'c K'c rotational quantum number 10- 11 I2 --- J" J" rotational quantum number 13- 14 I2 --- K"a K"a rotational quantum number 16- 17 I2 --- K"c K"c rotational quantum number 19- 28 F10.3 MHz FreqM Measured frequency 30- 39 F10.3 MHz FreqC Calculated frequency 41- 46 F6.3 MHz O-C Measured minus calculated frequency value 48- 51 A4 --- Ref References (1)
Note (1): 1: Hirose, 1974ApJ...189L.145H 2: Creswell & Schwendeman, 1974, Chem. Phys. Lett. 27, 521 The lack of a reference indicates that the line is reported here for the first time
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 2 I2 --- J' J' rotational quantum number 4- 5 I2 --- K'a K'a rotational quantum number 7- 8 I2 --- K'c K'c rotational quantum number 10- 11 I2 --- J" J" rotational quantum number 13- 14 I2 --- K"a K"a rotational quantum number 16- 17 I2 --- K"c K"c rotational quantum number 19- 28 F10.3 MHz Freq Frequency 30- 34 F5.3 MHz e_Freq rms uncertainty on Freq 36- 40 F5.2 D+2 mu2S Intensity (mu^2^S) (1) 42- 48 F7.3 cm-1 Eu Upper state energy
Note (1): S-value (Townes & Schawlow, 1975, Microwave Spectroscopy (New York: Dover)) multiplied by the square of the dipole moment
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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