Table 2
Line parameters of identified CH318OH and CH317OH.
| Molecule | Transition | Freq. (GHz) | Eu a (K) | Sμ2 (Debye2) |
|---|---|---|---|---|
| CH318OHb | 50–40 E | 231.686680 | 46.22 | 16.166 |
| CH318OHb | 5−1–4−1 E | 231.735830 | 38.99 | 15.569 |
| CH318OHb | 50–40 A+ | 231.758446 | 33.38 | 16.194 |
| CH318OHb | 54–44 A− | 231.768541 | 114.26 | 5.825 |
| CH318OHb | 54–44 A+ | 231.768542 | 114.26 | 5.825 |
| CH318OHb | 5−4–4−4 E | 231.777708 | 121.82 | 5.829 |
| CH318OHb | 54–44 E | 231.788110 | 129.55 | 5.867 |
| CH318OHb | 53–43 A+ | 231.796218 | 83.49 | 10.336 |
| CH318OHb | 53–43 A− | 231.796521 | 83.49 | 10.336 |
| CH318OHb | 53–43 E | 231.801304 | 81.31 | 10.372 |
| CH318OHb | 52–42 A− | 231.801466 | 70.86 | 13.755 |
| CH318OHb | 5−3–4−3 E | 231.809480 | 96.02 | 10.450 |
| CH318OHb | 51–41 E | 231.826744 | 54.14 | 16.171 |
| CH318OHb | 52–42 A+ | 231.840925 | 70.87 | 13.756 |
| CH318OHb | 5−2–4−2 E | 231.853853 | 59.26 | 13.625 |
| CH318OHb | 52–42 E | 231.864501 | 55.77 | 13.380 |
| CH317OHc | 50–40 E | 236.426222 | 47.09 | 4.041 |
| CH317OHc | 5−1–4−1 E | 236.483332 | 39.68 | 3.887 |
| CH317OHc | 52–42 A− | 236.553510 | 71.71 | 3.428 |
| CH317OHc | 53–43 E | 236.553786 | 82.09 | 2.590 |
| CH317OHc | 51–41 E | 236.584222 | 55.04 | 4.021 |
| CH317OHc | 5−2–4−2 E | 236.609861 | 60.04 | 3.403 |
| CH317OHc | 52–42 E | 236.615575 | 56.47 | 3.345 |
Notes. (a)The upper state energy. (b)The values are taken from CDMS (Müller et al. 2001) and are based on spectroscopic measurements by Hughes et al. (1951), Gerry et al. (1976), Hoshino et al. (1996), Predoi-Cross et al. (1997), Ikeda et al. (1998), and Fisher et al. (2007). (c)The values are taken from Tamanai et al. (2025). The effect from quadrupole hyperfine structure arising as a result of the nuclear spin of 17O (I = 5/2) is within the range of error in frequency.
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