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Table 3

Low-order spectroscopic parameters or differences (Δ) thereofa of methyl cyanide describing the Fermi interaction between ν8 = 1 and ν8 = 2.

Parameter CH3CNb CHCNc 13CH3CNc CH3C15Nc

716.750 42 (13) 701.10 715.82 711.53
Δ(AB) 187.404 (18) 187.4 187.4 187.4
ΔB 54.057 316 (111) 51.856 52.411 5 52.759 1
739.148 225 (56) 723.01 738.19 733.76
Δ(AB) 259.956 (122) 260.0 260.0 260.0
ΔB 54.502 729 (70) 52.283 3 52.843 35 53.193 85
138 656.042 (102) 139 829.5 138 858. 138 555.
q 17.729 857 (138) 18.141 2 16.738 2 16.794 9
F(8± 1,82, ∓ 2) 53 157.7 (33) 54 567. (744) 51 647. (1303) 51 298. (2967)
FK(8± 1,82, ∓ 2) 6. 6. 6. 6.
FJ(8± 1,82, ∓ 2) 0.369 89 (44) 0.370 0.359 0.359
FJJ(8± 1,82, ∓ 2) × 106 1.681 (87) 1.70 1.58 1.58

Notes.

(a)

All parameters in MHz units except and in cm-1. Numbers in parentheses are one standard deviation in units of the least significant figures. Parameters without quoted uncertainties were estimated and kept fixed in the analyses; see also Sect. 3.

(c)

This work. Ground state parameters for corresponding isotopolog kept fixed to values in Table 2.

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