J/A+A/402/1 Einstein A-coefficients for C3H2 and C2H4O (Chandra, 2003)
Transfer of radiation through cyclopropenylidene and ethylene oxide.
Chandra S.
<Astron. Astrophys. 402, 1 (2003)>
=2003A&A...402....1C 2003A&A...402....1C (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: ISM: molecules - molecular data - radiative transfer
Abstract:
Cyclopropenylidene C3H2 and ethylene oxide C2H4O molecules
are of astronomical importance as their observed lines, distributed
throughout the observable microwave region, have a number of pairs
having nearly equal frequencies, but different excitation energies
and/or belonging to two different species of the molecule. Hence,
these molecules may play important role in detecting physical
conditions in cosmic objects. Therefore, in order to calculate
intensities of the lines, we have investigated transfer of radiation
through a cosmic object containing the molecule at a kinetic
temperature of 10K. Our results show that some lines of the molecule
may be found in absorption against the cosmic 2.7K background.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1a.dat 38 186 A-coefficients for ortho-C3H2
table1b.dat 38 192 A-coefficients for para-C3H2
table1c.dat 38 224 A-coefficients for ortho-C2H4O
table1d.dat 38 223 A-coefficients for para-C2H4O
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See also:
J/A+A/376/333 : Einstein A-coefficients for C3H4 (Sharma+, 2001)
J/A+A/376/356 : Diatomic molecules collisional rates (Chandra+, 2001)
J/A+AS/114/175 : Einstein A-coefficients in CS transitions (Chandra+ 1995)
J/A+AS/117/557 : Einstein coefficients for CO transitions (Chandra+ 1996)
J/A+AS/131/137 : Einstein A-Coefficients in SiC2 transitions (Chandra+ 1998)
J/A+AS/142/113 : 3H2 and SiC2 collisional rates (Chandra+, 2000)
Byte-by-byte Description of file: table1[abcd].dat
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Bytes Format Units Label Explanations
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1- 22 A22 --- Trans Transition
31- 38 E8.2 1/s A Einstein A coefficient
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Acknowledgements: S. Chandra <chandrasuresh@123india.com>
(End) Patricia Bauer [CDS] 20-Feb-2003