Table 2
Direct isotopic ratios.
| Ratio | L483 | TMC-1 | L1521E | L1521B | L134N | L1544 | B1-b | L1527 |
|---|---|---|---|---|---|---|---|---|
| 12C/13C | ||||||||
| C17O/13C17O | 42 ± 13 | ... | ... | ... | ... | ... | ... | ... |
| C2H/13CCH | >162 | >250 (a) | ... | ... | ... | ... | ... | 210 ± 60 (b) |
| C2H/C13CH | >70 | >170 (a) | ... | ... | ... | ... | ... | 140 ± 40 (b) |
| c-C3H2 /c-HCC13CH ×2 | 106 ± 32 | ... | ... | ... | ... | ... | ... | 82 ± 16 (b) |
| c-C3H2 /c-HC13CCH | 458 ± 138 | ... | ... | ... | ... | ... | ... | 200 ± 30 (b) |
| c-C3HD/c-H13CCCD | 112 ± 34 | ... | ... | ... | ... | ... | ... | ... |
| c-C3HD/c-HCC13CD | 87 ± 26 | ... | ... | ... | ... | ... | ... | ... |
| CH3CCH/13CH3CCH | 60 ± 18 | ... | ... | ... | ... | ... | ... | ... |
| CH3CCH/CH313CCH | 53 ± 16 | ... | ... | ... | ... | ... | ... | ... |
| CH3CCH/CH3C13CH | 58 ± 17 | ... | ... | ... | ... | ... | ... | ... |
| CH2DCCH/13CH2DCCH | 22 ± 7 | ... | ... | ... | ... | ... | ... | ... |
| HC15N/H13C15N | 34 ± 10 | ... | ... | ... | ... | ... | ... | ... |
| H15NC/H15N13C | 29 ± 9 | ... | ... | ... | ... | ... | ... | ... |
| HC3N/H13CCCN | 91 ± 27 | 79 ± 11 (c) | ... | 117 ± 16 (d) | 61 ± 9 (d) | ... | ... | 86.4 ± 1.6 (e) |
| HC3N/HC13CCN | 93 ± 28 | 75 ± 10 (c) | ... | 117 ± 16 (d) | 94 ± 26 (d) | ... | ... | 85.4 ± 1.7 (e) |
| HC3N/HCC13CN | 79 ± 24 | 55 ± 7 (c) | ... | 76 ± 6 (d) | 46 ± 9 (d) | ... | ... | 64.2 ± 1.1 (e) |
| DC3N/DC13CCN | 30 ± 9 | ... | ... | ... | ... | ... | ... | ... |
| HNCO/HN13CO | 62 ± 19 | ... | ... | ... | ... | ... | ... | ... |
| C34S/13C34S | 58 ± 18 | ... | ... | ... | ... | ... | ... | ... |
| H2CS/H213CS | 113 ± 34 | 79 ± 26 (f)* | ... | ... | ... | ... | ... | ... |
| C2S/C13CS | 28 ± 8 | 54 ± 5 (g)* | 51 ± 13 (g)* | ... | ... | ... | ... | ... |
| C2S/13CCS | >25 | 230 ± 130 (g)* | >130 (g)* | ... | ... | ... | ... | ... |
| 14N/15N | ||||||||
| H13CN/H13C15N | 321 ± 96 | ... | ... | ... | ... | ... | ... | ... |
| HC3N/HC315N | 490 ± 147 | 257 ± 54 (h)* | ... | ... | ... | 400 ± 20 (i) | ... | ... |
| N2H+ /15NNH+ | >747 | ... | ... | ... | ... | 1110 ± 240 (j) | >600 (k) | ... |
| N2H+ /N15NH+ | >450 | ... | ... | ... | 670 (l) |
1050 ± 220 (j) | 400 (j) |
... |
| 16O/18O | ||||||||
| HNCO/HNC18O | 232 ± 70 | ... | ... | ... | ... | ... | ... | ... |
| SO/S18O | 158 ± 47 | ... | ... | ... | ... | ... | ... | ... |
| 16O/17O | ||||||||
| SO/S17O | 128 ± 38 | ... | ... | ... | ... | ... | ... | ... |
| 32S/34S | ||||||||
| 13CS/13C34S | 31 ± 9 | ... | ... | ... | ... | ... | ... | ... |
| H2CS/H2C34S | 29 ± 9 | ... | ... | ... | ... | ... | ... | ... |
| C2S/C234S | 17 ± 5 | ... | ... | ... | ... | ... | ... | ... |
| SO/34SO | 31 ± 9 | ... | ... | ... | ... | ... | ... | ... |
| SO2 /34SO2 | 31 ± 9 | ... | ... | ... | ... | ... | ... | ... |
| NS/N34S | 22 ± 7 | ... | ... | ... | ... | ... | ... | ... |
| HCS+ /HC34S+ | 21 ± 6 | ... | ... | ... | ... | ... | ... | ... |
| 32S/33S | ||||||||
| SO/33SO | 151 ± 45 | ... | ... | ... | ... | ... | ... | ... |
Notes. (*) Isotopic ratio is not direct but derived through the double isotope method.
References. (a) Sakai et al. (2010). (b) Yoshida et al. (2019). (c) Takano et al. (1998). (d) Taniguchi et al. (2017). (e) Araki et al. (2016). (f) Liszt & Ziurys (2012). (g) Sakai et al. (2007). (h) Taniguchi & Saito (2017). (i)Hily-Blant et al. (2018). (j)Bizzocchi et al. (2013). (k)Daniel et al. (2013). (l)Redaelli et al. (2018).
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