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Table 1
Spectroscopic parameters for observed CCC, C13CC, and 13CCC transitions.
| Transition | Frequency | Einstein Aul | El | gl | gu |
|---|---|---|---|---|---|
| MHz | s−1 | K | |||
| CCC | |||||
| Q(2) | 1 890 558.188 | 0.01468 | 3.7 | 5 | 5 |
| Q(4) | 1 896 706.838 | 0.01482 | 12.4 | 9 | 9 |
| Q(6) | 1 906 337.907 | 0.01505 | 26.0 | 13 | 13 |
| P(2) | 1 836 823.502 | 0.00449 | 3.7 | 5 | 3 |
| P(4) | 1 787 890.534 | 0.00532 | 12.4 | 9 | 7 |
| P(6) | 1 741 122.646 | 0.00521 | 26.0 | 13 | 11 |
| P(8) | 1 696 525.363 | 0.00495 | 44.6 | 17 | 15 |
| P(10) | 1 654 087.900 | 0.00466 | 68.1 | 21 | 19 |
| P(12) | 1 613 805.250 | 0.00437 | 96.6 | 25 | 23 |
| C13CC | |||||
| Q(2) | 1819596.013 | 0.01309 | 3.7 | 5 | 5 |
| Q(4) | 1825647.312 | 0.01322 | 12.4 | 9 | 9 |
| 13CCC | |||||
| Q(2) | 1882638.269 | 0.01450 | 3.6 | 5 | 5 |
| Q(4) | 1888501.880 | 0.01463 | 11.9 | 9 | 9 |
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