Table 3
Overview of the performed experiments and abundances of the formed species of VUV photolysis at 13 K of pure H2CO and a H2O:H2CO ice mixture.
| VUV photolysis of H2CO ice | ||||
| Pure H2CO | H2O:H2CO | |||
|
|
||||
| Species | N (molec cm-2) | (%) | N (molec cm-2) | (%) |
|
|
||||
| CO | 5 × 1016 | 18.5 | 6 × 1016 | 40 |
| CO2 | 1.6 × 1015 | 0.6 | 3.9 × 1016 | 26 |
| HCO | 4.3 × 1014 | 0.16 | 3.4 × 1015 | 2.3 |
| GA | 1.7 × 1015 | 0.6 | 6.5 × 1015 | 4.3 |
| EG | <1 × 1015 | <0.4 | 7 × 1015 | 4.7 |
| CH3OH | 2 × 1016 | 8 | 2.9 × 1016 | 19 |
| POM | 1.9 × 1017a | 72 | n.d | n.d |
| HCOOH | n.d | n.d. | <1 × 1015 | <1 |
| H2CO3 | n.d. | n.d | 1 × 1014 | <0.1 |
Notes. The time of photolysis is 3 h in the case of pure H2CO and 23 h in the case of the H2O:H2CO ice mixture. The total amount of H2CO consumed (Nc(H2CO)) is 2.7 × 1017 molec cm-2 for pure H2CO and 1.5 × 1017 for the H2O:H2CO ice mixture. The yields have been calculated as follows: (%)= N(X)/Nc(H2CO).
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