Up: Collisional rates for asymmetrical molecules
The calculations are made for
the upward transitions
.
For ortho-C3H2, we accounted for 47 energy levels given in Table 1A. The
calculations are done for the kinetic temperatures 30, 60, 90, and 120 K, and the
results are presented in Tables 3A, 3B, 3C, and 3D, respectively. For
para-C3H2, we accounted for 48 energy levels given in Table 1B. For this
case also, the calculations are done for the kinetic temperatures 30, 60, 90,
and 120 K, and the results are presented in Tables 4A, 4B, 4C, and 4D,
respectively. For ortho-SiC2, we accounted for 40 energy levels given in
Table 2. The calculations are done for the kinetic temperatures 25, 50,
75, 100,
and 125 K, and the results are presented in Tables 5A, 5B, 5C, 5D, and 5E,
respectively.
The rate coefficient for the
corresponding downward transition
can easily be calculated with the help of the
detailed equilibrium equation
where the energy E of the energy level is in cm-1. The Tables 3A, 3B, 3C, 3D, 4A, 4B, 4C,
4D, 5A, 5B, 5C, 5D and 5E are available only in electronic form via anonymous
ftp. However, a part of the Table 3A is given in printed form in order to have the information
about the content of the tables. There we have given (i) transition, (ii) collisional
rate coefficient (in cm3 s-1), (iii) lower energy level number(l) of the
transition (according to the
table of wave-functions), and (iv) upper energy level number(u) of the transition.
Acknowledgements
This work was done during the visit of Prof. S. Chandra under the scientific
exchange program between the INSA, New Delhi (India) and the DFG, Bonn (Germany).
Prof. Chandra is thankful to Prof. J.M. Waghmare, Vice-Chancellor of the S.R.T.M.
University, Nanded
for his encouragements.
Up: Collisional rates for asymmetrical molecules
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