Table 5
Destruction of CH4 and formation of C2H6 molecules due to interaction with different projectiles inside a dense molecular cloud aged 100 Myr.
| GCR | GCR | Yield | Column | Yield | Column | Ref. | |
| Projectile | flux | fluence | (CH4 | density | (C2H6) | density | |
| (particles/ | (particle/ | molecule/ | (1015 CH4 | molecule/ | (1015 C2H6 | ||
| cm2s) | cm2) | impact) | molec/cm2) | impact) | molec/cm2) | ||
|
|
|||||||
| UV (10.2 eV photons) | 1.00 × 103 | 3.15 × 1018 | 0.044 | 139 | 0.003 | 10.7 | 1 |
| H+ (7.3 MeV) | 3.18 × 10-2 | 1.00 × 1014 | 2.8* | 0.28 | 3.1* | 0.31 | 2 |
| He+ (9.0 MeV) | 1.60 × 10-3 | 5.03 × 1012 | 33.0 | 0.17 | 16.8 | 0.08 | 2 |
| 16O+7 (220 MeV) | 1.37 × 10-4 | 4.32 × 1011 | 506.8 | 0.22 | 129.5 | 0.06 | 3 |
Notes.
Table 13 of Kaiser & Roessler (1998) values are attached with large experimental errors: it should be reminded that the C2H6 formation yield must be always lower than half of the CH4 destruction yield.
References. 1Baratta et al. (2002), 2Kaiser & Roessler (1998), 3 this work.
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