Table 2
Production rate (
in 10−3 s−1) and corresponding fraction (%) of the total loss for the different X fragment channels produced in our VUV irradiation conditions.
| Fragment | ||||||||
|---|---|---|---|---|---|---|---|---|
| Parent | H | 2H or H2 | CHx | C2Hx | C3Hx | C4Hx |  |
 |
| Pyr+ | 1.9 + 2.8 | – | – | 0.3 | – | 0.06 | 0.07 | 0.13 |
| (C16, C14) | 38% + 55% | 6% | 1% | |||||
| H6-Pyr+ (a) | 3.1 | 0.7 + 4.2 | 0.7 | 4.4 + 0.9 | 2.2 | – | 1.1 (b) | 0.35 (b) |
| (C16, C15, | 19% | 5% + 24% | 5% | 7% + 6% | 14% | |||
| C14, C13, C12) | ||||||||
| MePyr+ | 2.2 + 4.4 | 0.2 + 0.8 | – | 0.8 + 1.1 | – | – | 0.25 | 0.29 |
| (C17, C15, C13) | 23% + 46% | 2% + 8% | 8% + 12% | |||||
| EtPyr+ | 3.1 | 0.7 | 1.4 | 0.9 | 0.6 | – | 0.78 | 0.42 |
| (C18, C17, | 46% | 10% | 21% | 14% | 9% | |||
| C15, C13) | ||||||||
| Cor+ | 0.16 + 0.34 | – | – | - | – | 0 | 0 | |
| (C24) | 32% + 68% | |||||||
| MeCor+ | 2.5 + 0.5 | 0.07 | – | 0.6 | – | – | 0.20 | 0.29 |
| (C25, C23) | 68% + 13% | 2% | 17% | |||||
| EtCor+ | 0.7 | 0.31 | 3.0 | 0.6 | – | – | 3.4 | 0.36 |
| (C26, C25, C23) | 16% | 7% | 64% | 13% | ||||
Notes. The CN list below each parent species corresponds to the number of carbons that belong to the detected fragments. The values in bold represent the contribution of the first fragmentation step. The ∑ CnHx∕∑ H, H2 ratio corresponds to the production rate of carbonaceous fragments (CHx, C2Hx, etc.) relativeto hydrogen (H, 2H, and H2) fragments. The ∑ C∕∑ H ratio corresponds to the production rate of C over H atoms. (a)For H6 -Pyr+, we have considered that the first CH5-loss channel corresponds to a CH3 loss plus a 2H or H2 loss. This has been taken into account in the calculated fractions and ratios that are displayed here. (b) These ratios are calculated for a total VUV irradiation time of 
s, which is shorter than the irradiation time of 1000 s used for the other species.
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