J/A+AS/131/137 Einstein A-Coefficients in SiC2 transitions (Chandra+ 1998)
Einstein A-Coefficients for rotational transitions in the ground vibrational
state of 28SiC2, 29SiC2 and 30SiC2
Chandra S., Rashmi
<Astron. Astrophys. Suppl. Ser. 131, 137 (1998)>
=1998A&AS..131..137C 1998A&AS..131..137C
ADC_Keywords: Atomic physics
Keywords: molecular data - ISM: molecules - radio lines: stars -
stars: IRC +10 216
Abstract:
Einstein A-coefficients for the electric dipole transitions in Silicon
Dicarbide molecule and its isotopomers between rotational levels of
the ground vibrational state up to 51cm-1 are calculated. These
coefficients are used for computing radiative life times of the
levels. The A-coefficients are one of the important input parameters
for the radiative transfer calculations.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 25 116 Einstein A-coefficients for the rotational transitions
in the ground vibrational state of 28SiC2
table3.dat 25 116 Einstein A-coefficients for the rotational transitions
in the ground vibrational state of 29SiC2
table4.dat 25 116 Einstein A-coefficients for the rotational transitions
in the ground vibrational state of 30SiC2
table5.dat 55 40 Energies and radiative lifetimes for the rotational
levels in the ground vibrational state 28^SiC2,
29SiC2 and 30SiC2
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See also:
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)
Byte-by-byte Description of file: table2.dat table3.dat table4.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- J' Rotational quantum number J'
4 I1 --- K'a Sub-quantum number K'a (1)
6- 7 I2 --- K'c Sub-quantum number K'c (1)
9- 10 I2 --- J Rotational quantum number J
12 I1 --- Ka Sub-quantum number Ka (1)
14- 15 I2 --- Kc Sub-quantum number Kc (1)
17- 25 D9.3 s-1 A Einstein A coefficient
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Note (1): Ka, Kc: odd, even ⟵> odd, odd (para-transition)
even, odd ⟵> even, even (ortho-transition)
Ka and Kc are sub-quantum numbers and each of them can assume the
values ranging from 0 to J.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- J' Rotational quantum number J'
4 I1 --- K'a Sub-quantum number K'a (1)
6- 7 I2 --- K'c Sub-quantum number K'c (1)
9- 14 F6.3 cm-1 E(28SiC2) Energy for 28SiC2
16- 23 D8.2 s T(28SiC2) ? Radiative lifetime for 28SiC2
25- 30 F6.3 cm-1 E(29SiC2) Energy for 29SiC2
32- 39 D8.2 s T(29SiC2) ? Radiative lifetime for 29SiC2
41- 46 F6.3 cm-1 E(30SiC2) Energy for 30SiC2
48- 55 D8.2 s T(30SiC2) ? Radiative lifetime for 30SiC2
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Note (1): Ka, Kc: odd, even ⟵> odd, odd (para-transition)
even, odd ⟵> even, even (ortho-transition)
Ka and Kc are sub-quantum numbers and each of them can assume the
values ranging from 0 to J.
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Acknowledgements: Suresh Chandra
(End) Patricia Bauer [CDS] 13-Feb-1998