J/A+A/543/A135 New analysis of 13C-CH3CH2CN up to 1THz (Richard+, 2012)
Analysis of the terahertz rotational spectrum of the three mono-13C ethyl
cyanide (13C-CH3CH2CN).
Richard C., Margules L., Motiyenko R.A., Guillemin J.C.
<Astron. Astrophys. 543, A135 (2012)>
=2012A&A...543A.135R 2012A&A...543A.135R
ADC_Keywords: Atomic physics
Keywords: line: identification - method: laboratory - molecular data -
techniques: spectroscopic - submillimeter: ISM - ISM: molecules
Abstract:
Millimeter- and submillimeter-wave spectra of regions such as the
Orion molecular cloud show many rotational-torsional lines that are
caused by the emission of complex organic molecules (COM). Previous
laboratory investigations have been conducted for three isotopologues
of ethyl cyanide up to 360GHz, and subsequently, several hundred
lines of the three isotopologues have been detected in Orion IRc2
using the IRAM 30m radiotelescope. In this survey we present the
analysis based on a Watson Hamiltonian for an asymmetric one-top rotor
of the 13C-substituted ethyl cyanide 13CH3CH2CN,
CH313CH2CN and CH3CH213CN in the frequency range
480-650GHz and 780-990GHz.The rotational spectra of the three
species were measured with a submillimeter spectrometer (50-990GHz)
using solid-state sources. A new set of spectroscopic parameters was
determined from a least-squares fit procedure for each isotopologue.
These parameters permit a new accurate prediction of rotational lines
suitable for an astrophysical detection in the submillimeter wave
range.
Description:
The tables present the experimental frequencies of rotational
transitions for the three 13C-isotopologues of ethyl cyanide, up to
1THz. The error on the frequency given in the tables is the standard
deviation.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 73 2019 Measured transitions of 13CH3CH2CN
tableb2.dat 73 2030 Measured transitions of CH313CH2CN
tableb3.dat 73 2180 Measured transitions of CH3CH213CN
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See also:
J/A+A/466/255 : Isotopic ethyl cyanide (Demyk+, 2007)
J/A+A/493/565 : Deuterated and 15N ethyl cyanides (Margules+, 2009)
J/ApJS/184/133 : New ground-state measurements of ethyl cyanide (Brauer+, 2009)
J/ApJ/714/476 : Complete spectrum of ethyl cyanide (Fortman+, 2010)
Byte-by-byte Description of file: tableb1.dat tableb2.dat tableb3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- J0 [1/100] J value of the lower state
7- 8 I2 --- Ka0 [0/33] Ka value of the lower state
11- 13 I3 --- Kc0 [0/100] Kc value of the lower state
17- 18 I2 --- J1 [0/99] J value of the upper state
22- 23 I2 --- Ka1 [0/33] Ka value of the upper state
27- 28 I2 --- Kc1 [0/99] Kc value of the upper state
33- 43 F11.4 MHz Freq [8000/951000] Measured frequency
48- 54 F7.4 MHz O-CA Observed minus calculated frequency in
Watson's A reduction
58- 64 F7.4 MHz O-CS Observed minus calculated frequency in
Watson's S reduction
68- 73 F6.4 MHz e_Freq Accuracy of the measure (1)
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Note (1): When accuracy is equal to 0.000, the line were excluded from the fit.
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Acknowledgements:
Cyril Richard, cyril.richard(at)phlam.univ-lille1.fr
(End) Cyril Richard [PhLAM - Lille], Patricia Vannier [CDS] 26-Jun-2012