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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
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:

       FileName      Lrecl  Records   Explanations

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


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

   Bytes Format Units   Label     Explanations

   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 K_a_ (1)
  14- 15  I2    ---     Kc        Sub-quantum number K_c_ (1)
  17- 25  D9.3  s-1     A         Einstein A coefficient

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.


Byte-by-byte Description of file: table5.dat

   Bytes Format Units   Label     Explanations

   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

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.


Acknowledgements: Suresh Chandra 

(End)                                         Patricia Bauer [CDS]   13-Feb-1998