J/ApJ/753/18 Far-IR spectrum of ethylene oxide (CH2-O-CH2) (Medcraft+, 2012)
The far-infrared rotational spectrum of ethylene oxide.
Medcraft C., Thompson C.D., Robertson E.G., Appadoo D.R.T., McNaughton D.
<Astrophys. J., 753, 18 (2012)>
=2012ApJ...753...18M 2012ApJ...753...18M
ADC_Keywords: Spectra, infrared ; Atomic physics
Keywords: Infrared: ISM; ISM: molecules; methods: laboratory; molecular data
Abstract:
High-resolution Fourier Transform Infrared spectroscopy (FTIR) spectra
of ethylene oxide (CH2-O-CH2) have been measured in the far-infrared
region using synchrotron radiation. A total of 1182 lines between
15/cm (450GHz) and 73/cm (2.2THz) were assigned, with Jmax=64,
expanding upon previous studies that had recorded spectra up to 12/cm,
Jmax=49. All available data were co-fitted to provide greatly
improved rotational constants for the ground vibrational state that
are capable of predicting transitions up to 73/cm.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2a.dat 53 666 Observed and predicted transition frequencies of
ethylene oxide in the ground vibrational state
table2b.dat 56 1182 *Observed and predicted transition frequencies of
ethylene oxide in the ground vibrational state
--------------------------------------------------------------------------------
Note on table2b.dat: Lines of this table are reported here for the first time.
--------------------------------------------------------------------------------
See also:
J/A+A/402/1 : Einstein A-coefficients for C3H2 and C2H4O (Chandra, 2003)
J/ApJ/499/517 : Ethylene oxide spectrum (Pan+, 1998)
Byte-by-byte Description of file: table2a.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- J' [1/49] The J' value
4- 5 I2 --- Ka' [0/35] The Ka' value
7- 8 I2 --- Kc' [0/20] The Kc' value
10- 11 I2 --- J" [0/49] The J" value
13- 14 I2 --- Ka" [0/34] The Ka" value
16- 17 I2 --- Kc" [0/21] The Kc" value
19- 27 F9.2 MHz Fobs [23061/357423] Observed transition frequency
(0.7/12cm-1)
29- 37 F9.2 MHz Fcalc Calculated transition frequency
39- 44 F6.3 MHz O-C [-0.5/0.5] Observed minus Calculated frequency
46- 49 F4.2 MHz e_Fobs [0.01/0.2] Uncertainty in Fobs
51- 53 A3 --- Ref [a-c ] Reference(s) (1)
--------------------------------------------------------------------------------
Note (1): Reference as follows:
a = Hirose 1974ApJ...189L.145H 1974ApJ...189L.145H
b = Creswell & Schwendeman 1974CPL....27..521C 1974CPL....27..521C
c = Pan et al. 1998, Cat. J/ApJ/499/517
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2b.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- J' [11/64] The J' value
4- 5 I2 --- Ka' [0/42] The Ka' value
7- 8 I2 --- Kc' [0/62] The Kc' value
10- 11 I2 --- J" [10/63] The J" value
13- 14 I2 --- Ka" [0/41] The Ka" value
16- 17 I2 --- Kc" [0/61] The Kc" value
19- 27 F9.6 cm-1 Fcm [15.3/72.8] Observed transition frequency
(460/2180GHz)
29- 38 F10.7 cm-1 Fcmc Calculated transition frequency
40- 49 F10.7 cm-1 O-C [-0.0006/0.002] Observed minus Calculated
frequency
51- 56 F6.4 cm-1 e_Fcm [0.0002] Uncertainty in Fcm
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 07-Feb-2014