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Table 1
Rotational constants of formamide.
| S-reduction | A-reduction | ||||
| Parameters | NH2CHO v = 0 | Parameters | NH2CHO v = 0 | NH2CHO ν12 | NH CHO v = 0 |
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| A (MHz) | 72716.89840(19)a | A (MHz) | 72716.89800(19) | 71738.72306(35) | 71058.2044(11) |
| B (MHz) | 11373.509642(28) | B (MHz) | 11373.582453(28) | 11351.591159(46) | 11372.56100(11) |
| C (MHz) | 9833.952804(27) | C (MHz) | 9833.881236(26) | 9839.250469(44) | 9801.88771(11) |
| DJ (kHz) | 7.761879(23) | ΔJ (kHz) | 7.985385(25) | 8.045855(47) | 7.92971(15) |
| DJK (kHz) | –67.83261(43) | ΔJK (kHz) | –69.17265(44) | –66.89468(83) | –68.7265(27) |
| DK (kHz) | 1400.6906(38) | ΔK (kHz) | 1401.8297(39) | 1316.3907(55) | 1391.412(54) |
| d1 (kHz) | 1.5757698(38) | δJ (kHz) | 1.5757972(33) | 1.5649226(80) | 1.603172(72) |
| d2 (kHz) | 0.1116821(18) | δK (kHz) | 36.12735(46) | 33.7255(12) | 35.398(11) |
| HJ (Hz) | 0.0093375(57) | ΦJ (Hz) | 0.0109407(68) | 0.010671(15) | 0.010969(60) |
| HJK (Hz) | –0.19637(18) | ΦJK (Hz) | 0.02458(46) | [ 0.0] | [ 0.0] |
| HKJ (Hz) | –5.7948(20) | ΦKJ (Hz) | –6.5546(25) | –6.0831(56) | –6.429(11) |
| HK (Hz) | 80.679(48) | ΦK (Hz) | 81.477(49) | 67.948(44) | 82.03(65) |
| h1 (Hz) | 0.0045512(18) | φJ (Hz) | 0.0047135(19) | 0.0045954(44) | 0.004926(36) |
| h2 (Hz) | 0.0008207(16) | φJK (Hz) | 0.06666(42) | 0.06623(88) | 0.0549(63) |
| h3 (Hz) | 0.00017663(30) | φK (Hz) | 12.506(21) | 10.428(20) | 11.155(63) |
| LJK (mHz) | –0.01208(49) | LJK (mHz) | –0.02370(49) | –0.0238(14) | [0.0] |
| LKKJ (mHz) | 0.4272(29) | LKKJ (mHz) | 0.4614(29) | 0.398(11) | [0.0] |
| LK (mHz) | –5.41(16) | LK (mHz) | –6.25(16) | [0.0] | [0.0] |
| l2 (mHz) | –0.00001296(26) | χaa (MHz) | 1.9543(13) | 1.7616(33) | 1.9653(27) |
| χaa (MHz) | 1.9544(12) | χcc (MHz) | –3.8511(11) | –3.5823(16) | –3.8631(29) |
| χcc (MHz) | –3.8510(11) | ||||
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| Nb | 1630(709) | 1630(709) | 1243(581) | 409(190) | |
| σ (MHz)c | 0.029 | 0.028 | 0.029 | 0.029 | |
| σwd | 0.72 | 0.72 | 0.70 | 0.70 | |
| JMax, Ka,Max | 65, 24 | 65, 24 | 63, 22 | 45, 15 | |
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