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Table 1.
Recommended rotational constants for SiC2, its isotopologues, and Si2C.
| Molecular parameters | Units MHz × | 28SiC2 a | 29SiC2 b | 30SiC2 c | 28Si13CCd | Si2Ce |
|---|---|---|---|---|---|---|
| A | 52474.02946(763) | 52472.578(284) | 52470.648(307) | 50455.638(151) | 64074.34272(404) | |
| B | 13158.710948(769) | 12948.75237(419) | 12753.23030(433) | 12874.27017(278) | 4395.623626(348) | |
| C | 10441.580439(714) | 10308.81308(486) | 10184.40505(493) | 10180.85968(261) | 4102.024844(630) | |
| ΔJ | 10−02 | 1.317942(334) | 1.279225(450) | 1.244118(401) | 1.270199(417) | 0.9732667(877) |
| ΔJK | 1.5383510(443) | 1.4972329(685) | 1.4592497(621) | 1.4571217(823) | −8.571519(556) | |
| ΔK | −1.267987(478) | −1.2364(239) | −1.2244(237) | −1.2334(158) | 23.59437(205) | |
| δJ | 10−03 | 2.413326(754) | 2.31099(374) | 2.21188(378) | 2.38835(322) | 1.524128(254) |
| δK | 10−01 | 8.697376(898) | 8.47167(612) | 8.25767(607) | 8.23435(476) | 0.52877(154) |
| HJ | 10−07 | −1.4728(794) | −1.4728f | −1.4728f | −1.4728f | −0.35784(513) |
| HJK | 10−05 | −4.8821(309) | −4.6357(159) | −4.4451(198) | −3.684(180) | 1.9421(109) |
| HKJ | 10−04 | 3.8901(129) | 3.73431(853) | 3.6219(118) | 3.2920(703) | −18.6228(904) |
| HK | 10−02 | ..... | ..... | ..... | ..... | 4.9121(180) |
| hJ | 10−09 | ..... | ..... | ..... | ..... | −4.1625(956) |
| hJK | 10−05 | −3.5660(168) | −3.387(120) | −3.419(128) | −3.1254(778) | −0.3441(148) |
| hK | 10−03 | 1.07106(575) | 1.07106f | 1.07106f | 1.0909(385) | ..... |
| LJ | 10−11 | 4.706(558) | 4.706f | 4.706f | 4.706f | ..... |
| LJJK | 10−09 | −1.211(172) | −1.211f | −1.211f | −1.211f | 0.7511(566) |
| LJK | 10−07 | −1.3680(208) | −1.3680f | −1.3680f | −1.3680f | −1.2081(781) |
| LKKJ | 10−07 | 2.051(106) | 2.051f | 2.051f | 2.051f | 12.36(259) |
| PJ | 10−15 | −9.52(119) | −9.52f | −9.52f | −9.52f | ..... |
| PKJ | 10−10 | 1.3096(919) | 1.3096f | 1.3096f | 1.3096f | ..... |
| PKKJ | 10−10 | −2.777(462) | −2.777f | −2.777f | −2.777f | ..... |
| pKKJ | 10−10 | 5.894(167) | 5.894f | 5.894f | 5.894f | ..... |
| Jmax | .... | 53 | 16 | 17 | 19 | 45 |
| Kmax | .... | 16 | 8 | 8 | 10 | 5 |
| νmax | 1112643.6 | 359527.359 | 359324.483 | 404227.741 | 350484.8 | |
| σ | 2.105 | 0.137 | 0.123 | 0.107 | 0.343 | |
| σw | .... | 0.944 | 1.079 | 0.976 | 0.880 | 0.996 |
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