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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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