Table A.1
Nuclear statistical weight gns values for all symmetries of methyl cyanide according to the reference.
| Bunker & Jensen (1989) | 12 |
| JPL/CDMS/Mangum & Shirley (2015) | 4/3 |
| Rinsland et al. (2008) | 8 |
| Blake et al. (1987) | 2/3 |
| Turner (1991) | 1/3 (a) |
Notes. (a) According to Turner (1991) and Loren & Mundy (1984), the values of gns = gI gK (Eq. (10)) for the rotational states with quantum number K = 0 or K≠ 3n (n is an integer) are half the values of K = 3n states. This happens if the two K = 3n rotational states (with A1 and A2 symmetries)are considered as degenerate K-doublet and, in this case, the value of gns of K = 3n states should be two times the value of gns for the rotational states split into A1 and A2 species. Therefore, in case the A symmetry rotational states are considered degenerated for this molecular species, e.g., at low temperatures, it could be necessary to distinguish between the K = 3n-doublet, considered as ortho, and the K≠3n states (with E symmetry), considered as para (Loren & Mundy 1984).
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