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Table 4
Effective spectroscopic constants determined from state-by-state fits of the rotational transitions measured for the v4 = 2, v4 = 3, v5 = 2 and v5 = 3 states of 12C2HDa.
| Parameter | Unit | v4 = 2 | v4 = 3 | v5 = 2 | v5 = 3 |
|
|
|||||
| B | MHz | 29887.55176(34) | 29971.53551(53) | 29816.92379(54) | 29864.91215(61) |
| Previous value | 29969.052(43)c | 29861.189(27)c | |||
| D | kHz | 36.3586(26) | 37.470(20) | 35.0859(42) | 35.6706(42) |
| γ 44 | MHz | –2.47788(10) | –2.512476(79) | ||
| δ 44 | kHz | –0.07435(86) | –0.0484(39) | ||
| γ 55 | MHz | –3.70183(17) | –3.77613(11) | ||
| δ 55 | kHz | –0.0767(14) | –0.0767b | ||
| q t | MHz | 134.29328b | 135.53447(47) | 107.15528b | 108.61081(56) |
| Previous value | 135.529(25)c | 108.642(28)c | |||
|
kHz | –1.2082b | –1.2653(44) | –0.6905b | –0.7267(47) |
| g 44 | GHz | 65.82005(36) | 67.137(12) | ||
| g 55 | GHz | 156.406(11) | 158.484(62) | ||
| σ fit | kHz | 5.0 | 8.0 | 8.1 | 10.0 |
| No. of lines | 22 | 24 | 22 | 20 | |
| J range | 1–9 | 1–8 | 1–9 | 1–8 | |
Notes.
(c)
From Matsumura et al. (1980).
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