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Table 1
Transitions of (CH2OH)2 in the observed frequency range.
| Transition | Frequency | E up | log 10(Aul) | Rotational diagram |
| [MHz] | [K] | [s-1] | ||
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| 3 mm observations | ||||
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| 91,8v = 1−81,7v = 0 | 100 333.6424 | 23.6 | –4.6773 | W51/e2 |
| 93,6v = 1−83,5v = 0 | 100 490.6121 | 27.0 | –4.6800 | |
| 111,10v = 1−102,9v = 1 | 102 064.0770 | 33.9 | –4.6692 | |
| 101,10v = 1−91,9v = 0 | 102 291.5860 | 26.2 | –4.5798 | |
| 92,7v = 1−82,6v = 0 | 102 539.4267 | 25.0 | –4.6355 | |
| 100,10v = 1−90,9v = 0 | 102 689.8384 | 26.1 | –4.4419 | |
| 119,2v = 0−109,1v = 1 | 105 574.9490 | 72.2 | –4.9342 | |
| 118,4 / 3v = 0−108,3 / 2v = 1 | 105 644.1940 | 63.9 | –4.5179 | |
| 111,10v = 0−101,9v = 1 | 105 701.0020 | 33.6 | –4.3644 | |
| 117,5 / 4v = 0−107,4 / 3v = 1 | 105 735.3520 | 56.5 | –4.4051 | |
| 113,9v = 0−103,8v = 1 | 105 834.6960 | 36.9 | –4.5676 | |
| 116,6 / 5v = 0−106,5 / 4v = 1 | 105 866.9546 | 50.1 | –4.3228 | |
| 115,7v = 0−105,6v = 1 | 106 072.0524 | 44.7 | –4.6197 | |
| 115,6v = 0−105,5v = 1 | 106 088.9178 | 44.8 | –4.5104 | |
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| 1 mm observations | ||||
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| 2417,8 / 7v = 0−2317,7 / 6v = 1 | 238 828.3252 | 289.3 | –3.4806 | |
| 2416,9 / 8v = 0−2316,8 / 7v = 1 | 238 904.3833 | 273.1 | –3.4330 | |
| 2415,10 / 9v = 0−2315,9 / 8v = 1 | 238 993.6343 | 257.9 | –3.3925 | |
| 3012,19 / 18v = 1−3011,19 / 20v = 0 | 238 994.0910 | 299.7 | –4.8643 | |
| 225,17v = 1−215,16v = 0 | 238 994.7545 | 138.6 | –3.5149 | |
| 2413,12 / 11v = 0−2313,11 / 10v = 1 | 239 231.3329 | 230.4 | –3.3269 | |
| 2412,13 / 12v = 0−2312,12 / 11v = 1 | 239 395.0677 | 218.2 | –3.3002 | |
| 2411,14 / 13v = 0−2311,13 / 12v = 1 | 239 605.3330 | 206.9 | –3.2765 | |
| 253,23v = 0−243,22v = 1 | 239 792.7984 | 161.6 | –3.4697 | |
| 2410,15 / 14v = 0−2310,14 / 13v = 1 | 239 883.5631 | 196.7 | –3.2555 | W51/e2 |
| 252,23v = 0−242,22v = 1 | 239 957.1582 | 161.6 | –3.4917 | |
| 234,20v = 1−224,19v = 0 | 239 980.0390 | 144.1 | –3.4495 | |
| 243,21v = 0−233,20v = 1 | 240 147.9627 | 155.2 | –3.4704 | |
| 249,16 / 15v = 0−239,15 / 14v = 1 | 240 265.7687 | 187.4 | –3.2365 | |
| 224,19v = 0−213,18v = 0 | 240 608.1463 | 132.6 | –3.9839 | |
| 251 / 0,25v = 1−241 / 0,24v = 0 | 240 778.3210 | 148.0 | –3.1643 | |
| 248,17v = 0−238,16v = 1 | 240 807.8795 | 179.2 | –3.5201 | W51/e2 and G34.3+0.2 |
| 248,16v = 0−238,15v = 1 | 240 828.8863 | 179.2 | –3.5199 | |
| 224,18v = 1−214,17v = 0 | 240 875.3680 | 135.5 | –3.4905 | |
| 5910,50v = 1−599,51v = 1 | 240 888.3533 | 925.5 | –4.4992 | |
| 245,20v = 0235,19v = 1 | 241 291.2695 | 160.7 | –3.5046 | |
| 247,18v = 0−237,17v = 1 | 241 545.2626 | 172.1 | –3.5045 | |
| 247,17v = 0−237,16v = 1 | 241 817.6908 | 172.1 | –3.5026 | |
| 246,19v = 0−236,18v = 1 | 241 860.7330 | 166.0 | –3.5459 | |
| 2315,9 / 8v = 1−2215,8 / 7v = 0 | 242 244.6928 | 246.4 | –3.4004 | |
| 2314,10 / 9v = 1−2214,9 / 8v = 0 | 242 246.3392 | 232.2 | –3.3608 | |
| 2316,8 / 7v = 1−2216,7 / 6v = 0 | 242 267.1576 | 261.6 | –3.4470 | |
| 2313,11 / 10v = 1−2213,10 / 9v = 0 | 242 277.7167 | 218.9 | –3.3268 | |
| 2317,7 / 6v = 1−2217,6 / 5v = 0 | 242 309.7823 | 277.8 | –3.5027 | |
| 2312,12 / 11v = 1−2212,11 / 10v = 0 | 242 347.0348 | 206.7 | –3.2973 | |
| 2318,6 / 5v = 1−2218,5 / 4v = 0 | 242 369.7298 | 295.0 | –3.5709 | |
| 262 / 1,25v = 0−252 / 1,24v = 1 | 242 389.2838 | 166.9 | –3.1601 | |
| 2311,13 / 12v = 1−2211,12 / 11v = 0 | 242 466.6909 | 195.4 | –3.2714 | |
| 2310,14 / 13v = 1−2210,13 / 12v = 0 | 242 656.2283 | 185.2 | –3.2486 | W51/e2 and G34.3+0.2 |
| 233,20v = 1−22319v = 0 | 242 897.4293 | 143.6 | –3.7464 | |
| 239,15 / 14v = 1−229,14 / 13v = 0 | 242 948.2909 | 175.9 | –3.2282 | W51/e2 |
| 246,18v = 0−236,17v = 1 | 243 259.7398 | 166.3 | –3.8001 | |
| 238,16v = 1−228,15v = 0 | 243 396.0258 | 167.7 | –3.5106 | |
| 238,15v = 1−228,14v = 0 | 243 408.4357 | 167.7 | –3.5105 | |
| 235,19v = 1−22518v = 0 | 243 636.5668 | 149.1 | –3.4704 | |
| 237,17v = 1−227,16v = 0 | 244 054.2878 | 160.5 | –3.4934 | |
| 237,16v = 1−227,15v = 0 | 244 233.4545 | 160.5 | –3.4927 | |
| 243,22v = 1−233,21v = 0 | 244 399.6722 | 150.1 | –3.4754 | |
| 242,22v = 1−232,21v = 0 | 244 685.1477 | 150.1 | –3.4399 | |
| 236,18v = 1−226,17v = 0 | 244 879.9193 | 154.4 | –3.5188 | |
| 271 / 0,27v = 0−261 / 0,26v = 1 | 245 022.7624 | 171.4 | –3.1407 | |
| 246,19v = 1−236,17v = 1 | 245 410.9218 | 166.3 | –3.7580 | |
Notes. Catalog values for the (CH2OH)2 transitions that can be excited in the observed frequency range for W51/e2 and G34.3+0.2. Some faint transitions have been excluded from this table, please Sect. 3. The source names are listed for the lines that are used in the rotational diagram analysis.
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