Table 5
Deuterium fractionation of selected (complex) organic molecules toward Sgr B2(N2) compared to predictions of astrochemical models.
| Molecule | Statusa | [XD]/[XH] | |||
|
|
|||||
| N2b | T14c | A12d | |||
| % | % | % | |||
|
|
|||||
| CH2DCN | d | 0.38 | 3.6–0.15 | 2.3–6.3 | |
| CH2DCH2CN (oop) | t | 0.05 | – | – | |
| CH2DCH2CN (ip) | n | <0.024 | – | – | |
| CH3CHDCN | t | 0.05 | – | – | |
| cis-CHDCHCN | n | <0.8 | – | – | |
| trans-CHDCHCN | n | <0.8 | – | – | |
| CH2CDCN | n | <0.5 | – | – | |
| DC3N | t | 0.09 | – | 5.4–1.1 | |
| CH2DOH | t | 0.12 | 5.5–0.51 | 2.4–2.4e | |
| CH3OD | n | <0.07 | 3.5–0.3 | –e | |
| CH3CH2OD | n | <1.5 | – | – | |
| CH3CHDOH | n | <1.5 | – | – | |
| CH2DCH2OH (oop) | n | <1.5 | – | – | |
| CH2DCH2OH (ip) | n | <1.0 | – | – | |
| CH2DOCHO (oop) | n | <2.0 | 14–0.43f | – | |
| CH2DOCHO (ip) | n | <0.6 | 7–0.22f | – | |
Notes. The notations oop and ip describe the position of the deuterium and stand for out of plane and in plane, respectively.
Deuterium fractionation predicted by the model of Taquet et al. (2014) in the hot corino at the beginning and end of the Class 0 phase.
Deuterium fractionation predicted by the model of Aikawa et al. (2012) in the hot corino at the beginning and end of the Class 0 phase.
The model of Aikawa et al. (2012) was not designed to predict the abundance ratios of deuterated isomers: it assumes statistical branching ratios.
The model of Taquet et al. (2014) does not distinguish between the in-plane and out-of-plane conformers. The values listed here assume a statistical distribution (2:1).
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