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Table 2
Derived fractionation ratios for the various forms of formaldehyde.
| Species | Ratio | Comb.a | D/H |
|---|---|---|---|
| HDCO / H2CO | 6.8 % |
6.5±1% | 3.25±1% |
| HDC18O/H2C18O | 6.0 ± 1.5% | – | |
| D2CO / HDCO | 12.8 % |
25.6 % |
|
| D2CO / H2CO | 0.9 % |
0.6(4) ± 0.1% | 8.0 ± 0.1% |
| D213CO/H213CO | 0.6 % |
– | |
| H2CO / H213CO | 52 |
56 |
|
| D2CO / D213CO | 74 |
– | |
| H2CO / H2C18O | 800 |
805 |
|
| HDCO / HDC18O | 908 ± 263 | – | |
| H2CO / H2C17O | 2596 |
||
| H2C18O / H2C17O | 3.2 |
||
Notes. The errors are propagated from the uncertainty in the determined column densities. (a) Combined isotopologueratio (following Barlow 2003).
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