Table 2
Spectroscopic parameters of CH2CCH (in MHz).
| Parameter | Global Fit | Tanaka et al. (1997) |
|---|---|---|
| A | 288 055 (a) | 288 055 |
| B | 9523.6746(41) | 9523.6775(60) |
| C | 9206.8776(41) | 9206.8805(60) |
| ΔN | 0.003004(72) | 0.003440(63) |
| ΔNK | 0.3758(28) | 0.3753(28) |
| ΔK | 22.62 (a) | 22.62 |
| δN | 0.000103 (a) | 0.000103 |
| δK | 0.1575 (a) | 0.1575 |
| εaa | −529.386(60) | −529.386(60) |
| εbb | −11.524(31) | −11.524(30) |
| εcc | −0.520(31) | −0.520(30) |
 |
−36.322(25) | −36.323(24) |
 |
17.400(26) | 17.400(24) |
 |
−17.220(38) | −17.220(37) |
 |
−54.20(12) | −54.21(11) |
 |
−14.122(20) | −14.121(19) |
 |
12.88 (a) | 12.88 |
| rms (b) | 6.3 | 7.0 |
| N (c) | 55 | 46 |
Notes. Numbers in parentheses are 3σ uncertainties in units of the last digits. Ha and Hm refer to theacetylenic and methylenic hydrogen nuclei, respectively. (a)Parameter fixed to the value reported by Tanaka et al. (1997). (b)Standard deviation of the fit (in kHz). (c)Number of lines included in the fit.
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