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Table 3
Spectroscopic and observational parameters for the transitions of CCH and c-C3H2 observed with IRAM 30 m.
| Species | Transition | Frequency | A-coeff | E l | θ FWHM | F eff a | B eff b |
| (MHz) | (s-1) | (cm-1) | (″) | ||||
|
|
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| CCH, NJ,F | 13/2,1–01/2,1 | 87 284.1050 | 2.60 × 10-7 | 0.0015 | 29″ | 0.95 | 0.75 |
| 13/2,2–01/2,1 | 87 316.8980 | 1.53 × 10-6 | 0.0015 | 29″ | 0.95 | 0.75 | |
| 13/2,1–01/2,0 | 87 328.5850 | 1.27 × 10-6 | 0.0015 | 29″ | 0.95 | 0.75 | |
|
|
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| c-C3H2, (JKa,Kc) | 21,2–10,1 | 85 338.8930 | 2.32 × 10-5 | 1.7 | 29″ | 0.95 | 0.75 |
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