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Table 1
Model parameters.
| Parameter | Definition | Value(s) |
|
|
||
| G0 | radiation field | 101.0−105.5 |
| nH | number density | 102−107 cm-3 |
| σadd | hydrogenation cross section | 1.10 Å 2/C atom |
| σabs | abstraction cross section | 0.06 Å 2/C atom |
| Eadd | hydrogenation barrier | see Table A.1 |
| Eabs | abstraction barrier | 10 meV |
| NH,max | maximum column density | 1023 cm-2 |
| kph | photodesorption rate | see Table A.2 |
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