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Table A.1

Ab initio rotational parameters for formamide (from the B3LYP/6+311+G(3df,2pd) calculation).

Parameter Value Tgg/Bg

A (MHz) 73 818.88
B (MHz) 11 393.02
C (MHz) 9869.75
Taa (kHz) –1369.8  − 7.5 × 10-5
Tbb (kHz) –10.916  − 3.9 × 10-6
Tcc (kHz) –4.732  − 1.9 × 10-6
Tab (kHz) 31.187
Tac (kHz) 27.362
Tbc (kHz) 6.957
2R5 (kHz) 3.458
R6 (kHz) –0.0108
2.9 × 10-7
2.8 × 10-8

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