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Table 1.
Spectroscopic constants (first seven rows) and physical parameters (last two rows) for HC9N in the ground and eight ν19 excited states.
| ν19 = 0 | ν19 = 1 | ν19 = 2 | ν19 = 3 | ν19 = 4 | ν19 = 5 | ν19 = 6 | ν19 = 7 | ν19 = 8 | |
|---|---|---|---|---|---|---|---|---|---|
| B (MHz) | 290.518317(8) | 290.8844(3) | 291.2524(7) | 291.6231(7) | 292.0013(3) | 292.3653(5) | 292.7245(6) | 293.0949(3) | 293.4648(4) |
| αn (MHz) | 0.3661(3) | 0.3670(7) | 0.3683(7) | 0.3707(3) | 0.3694(5) | 0.3577(6) | 0.3681(3) | 0.3683(4) | |
| D (Hz) | 0.860(7) | 0.88(4) | 0.90(6) | 0.88(5) | 0.88(0) | 0.88(0) | 0.88(0) | 0.88(0) | 0.88(0) |
| q (MHz) | 0.1463(1) | 0.147(13) | 0.1458(1) | 0.145(4) | 0.145(5) | 0.139(4) | |||
| XL (MHz) | 1273(18) | 1126(17) | 1159(58) | 1134(11) | 1118(54) | ||||
| DJℓ (kHz) | –0.33(11) | –0.82(11) | –1.176(35) | –0.62(4) | –0.17(2) | ||||
| ρ (Hz) | –1.54(7) | –1.69(3) | –1.55(1) | ||||||
| Trot (K) | 27.5 ± 0.7 | 30.4 ± 0.9 | 30.6 ± 2.2 | 46.0 ± 5.2 | 45 ± 14 | 42 ± 19 | 37 ± 11 | 57 ± 31 | 60 ± 35 |
| Ncol × 10−13 cm−2 | 3.22 ± 0.20 | 2.10 ± 0.14 | 1.60 ± 0.26 | 1.07 ± 0.19 | 0.59 ± 0.42 | 0.86 ± 0.45 | 0.83 ± 0.35 | 0.28 ± 0.22 | 0.26 ± 0.22 |
Notes. For spectroscopy, see text and Yamada et al. (1985). Null uncertainty: Fixed parameter. Trot and Ncol derived from bottom panel of Fig. 2.
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