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 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:
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FileName Lrecl Records Explanations
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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
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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
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Bytes Format Units Label Explanations
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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)
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Note (1): 1: Hirose, 1974ApJ...189L.145H 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
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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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 (µ2S) (1)
42- 48 F7.3 cm-1 Eu Upper state energy
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Note (1): S-value (Townes & Schawlow, 1975, Microwave Spectroscopy (New York:
Dover)) multiplied by the square of the dipole moment
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History: From ApJ electronic version
(End) James Marcout, Patricia Bauer [CDS] 09-Mar-1999