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Table A.2
Spectroscopic constants determined for the ground state of CH3NCO (νb = 0, m = 0).
| Constant | Koput (1986) | Hyperfine resolved | Hyperfine unresolved | All data | ||
| J ≤ 2,Ka ≤ 1 | J ≤ 42,Ka ≤ 2 | |||||
|
|
||||||
| Aa (MHz) | 73 849.2 | 128 356.(7623)b | 128 435.(19) | 128 402. (13) | ||
| B (MHz) | 4392.22 | 4414.2478(12) | 4414.6182(93) | 4414.6287 (75) | ||
| C (MHz) | 4256.66 | 4257.1309(12) | 4256.7490(85) | 4256.7452 (71) | ||
| ΔJ (kHz) | 2.45(40) | 2.3209 (11) | 2.32319 (98) | |||
| ΔJK (kHz) | −1202.3(23) | −1274.0 (13) | −1271.46 (73) | |||
| δJ (kHz) | 0.4042 (14) | 0.4038 (14) | ||||
| δK (kHz) | 183.1 (43) | 187.4 (35) | ||||
| ΦJ (Hz) | −0.00191(47) | −0.00142 (45) | ||||
| ΦJK (Hz) | −5.39(24) | −5.64 (18) | ||||
| ΦKJ (Hz) | −68478.(285) | −67991. (167) | ||||
| φJK (Hz) | −47.6(14) | −47.7 (14) | ||||
| χaa (MHz) | 2.8358(75) | 2.8461(18) | 2.8441 (49) | |||
| χbb (MHz) | −1.288(21) | −1.2981(30) | −1.2962 (67) | |||
| χcc (MHz) | −1.548(21) | −1.5481(30) | −1.5478 (67) | |||
| Nlinesc | 13 | 32 | 201 | 233 | ||
| σfitd (kHz) | 6 | 3 | 94.6 | 91.2 | ||
| σrmse | 0.842 | 0.674 | 1.89 | 1.87 | ||
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