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Table 1

Known interstellar Class I methanol maser transitions.

Transition Frequency (MHz) Lab. Ref. Astronomical reference
9-1 → 8-2-E 9936 L2 A28
101 → 92-A− 23 445 L5 A48
32 → 31-E 24 929 L3 A12, A20
42 → 41-E 24 933 L1 A1, A6, A8, A12, A20
22 → 21-E 24 934 L1 A7, A12, A17, A20
52 → 51-E 24 959 L4 A1, A6, A12, A17, A20, A24
62 → 61-E 25 018 L4 A1, A2, A3, A17, A20, A4*, A5, A6, A7, A8,A9, A12,
A13, A17, A20, A24, A26*, A36, A38*
72 → 71-E 25 125 L4 A1, A2, A3, A17, A20
82 → 81-E 25 294 L4 A1, A6, A17
92 → 91-E 25 541 L4 A12, A32
102 → 101-E 25 878 L4 A39
122 → 121-E 26 847 L5 A32
132 → 131-E 27 473 L5 A32
142 → 141-E 28 169 L5 A32
152 → 151-E 28 906 L5 A32
162 → 161-E 29 637 L5 A32
172 → 171-E 30 308 L5 A32
4-1 → 30-E 36 169 L5 A4, A9, A10, A13, A19, A25, A26, A27, A33, A51
70 → 61-A+ 44 069 L5 A4, A9,A10, A21, A22, A26, A30, A34, A37, A44, A46, A47, A51
5-1 → 40-E 84 521 L3 A14, A13, A26,A42
80 → 71-A+ 95 169 L3 A11, A18, A23, A26, A29, A31, A49, A50
11-1 → 10-2-E 104 300 L3 A43
6-1 → 50-E 132 891 L5 A26, A35, A40
90 → 81-A+ 146 618 L5 A26
42 → 31-E 218 440 L6 A52
8-1 → 70E 229 758 L6 A43
9-1 → 80-E 278 305 L6 A53

Reference. References are in chronological order. Laboratory references for higher accuracy frequencies are: L1: Gaines et al. (1974); L2: Breckenridge & Kukolich (1995); L3: Müller et al. (2004); L4: Tsunekawa et al. (1995); L5: Mehrotra et al. (1985); L6: Sastry et al. (1984). Astronomical references presenting interferometric observations are given in italics, theoretical papers in boldface. Theoretical references discussing various of the J2 → J1-E transitions are only listed for the 62 → 61-E transition and are marked by an asterisk. Astronomical references are: A1: Barrett et al. (1971); A2: Chui et al. (1974); A3: Hills et al. (1975); A4*: Pelling (1975); A5: Barrett et al. (1976) (VLBI); A6: Barrett et al. (1975); A7: Buxton et al. (1977); A8: Matsakis et al. (1980); A9: Sobolev & Strelnitskii (1983); A10: Morimoto et al. (1985); A11: Nakano & Yoshida (1986); A12: Menten et al. (1986); A13: Zeng et al. (1987); A14: Batrla & Menten (1988); A17: Menten et al. (1988d,c); A18: Plambeck & Wright (1988); A19: Haschick & Baan (1989); A20: Menten & Batrla (1989); A21: Haschick et al. (1990); A22: Bachiller et al. (1990); A23: Plambeck & Menten (1990); A24: Johnston et al. (1992); A25: Kalenskii et al. (1992); A26*: Cragg et al. (1992); A27: Haschick & Baan (1989); A28: Slysh et al. (1993); A29: Kalenskii et al. (1994); A30: Slysh et al. (1994); A31: Val’tts et al. (1995); A32: Wilson et al. (1996); A33: Liechti & Wilson (1996); A34: Mehringer & Menten (1997); A35: Slysh et al. (1997); A36: Johnston et al. (1997); A37: Kogan & Slysh (1998); A38*: Matsakis et al. (1980); A39: Sobolev et al. (1998); A40: Slysh et al. (1999); A41: Val’tts et al. (2000); A42: Kalenskii et al. (2001); A43: Slysh et al. (2002); A44: Kurtz et al. (2004); A45: Voronkov et al. (2005); A46: Cyganowski et al. (2009); A47: Fontani et al. (2010); A48: Voronkov et al. (2011); A49: Chen et al. (2011); A50: Gan et al. (2013); A51: Voronkov et al. (2014); A52: Hunter et al. (2014); A53: Yanagida et al. (2014).

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