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Table 3.
Total electron-impact ionisation cross-sections σimpact(X); initial fractions fi(X, g) and averaged sputtering yield YX.
| Species (X) | σimpact(a) | fi(X, g) | YX |
|---|---|---|---|
| Å2 | molecules ion−1 | ||
| H2 | 1.021 | 0.43 | (3.4±1.0)×104 |
| CO | 2.516 | 0.39 | (2.9±0.8)×104 |
| C | 2.317 | 0.04 | (4.5±4.1)×103 |
| O | 1.363 | 0.01 | (4.3±3.9)×103 |
| H2CO | 4.140 | 0.13 | (2.5±2.3)×103 |
Notes.
(a)
From the NIST database (https://webbook.nist.gov/chemistry/), except 
and 
from Kim & Desclaux (2002).
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