Table 2
Comparisons of the integral absorption coefficient A (10-18 cm molecule-1) used in the current work with those reported in literature for the CH4 and for its products formed by the heavy ion irradiation.
| Molecule | Position | Mulas et al. | Moore et al. | Kaiser et al. | Gerakines et al. | Gerakines et al. | Brunetto et al. | This work* |
| cm-1 | (1998) | (1998) | (1998) | (1996) | (2005) | (2008) | ||
|
|
||||||||
| CH4 | 4300 | – | – | 3.5 | – | 3.4 | 0.69 | 0.43 |
| 4202 | – | – | 1.6 | – | 1.6 | 0.36 | 0.36 | |
| 3009 | 9.5 | – | – | 6.4 | – | – | 10.5 | |
| 2815 | – | – | – | – | 1.9 | 0.28 | 0.26 | |
| 1300 | 6.4 | 6.63 | 6.2 | 6.1 | 7.0 | – | 7.76 | |
| CH3 | 608 | – | – | 25 | 25 | – | – | 25 |
| C2H2 | 736 | – | – | 14 | – | – | – | 14 |
| 3267 | – | – | 32 | – | – | – | 32 | |
| C2H4 | 952 | – | – | 15 | – | – | – | 15 |
| 1436 | – | 2.93 | – | 0.85 | – | – | 1.2 | |
| 3095 | – | – | 1.0 | – | – | – | 1.0 | |
| C2H6 | 821 | – | – | 1.9 | – | – | – | 1.9 |
| 1463 | – | 4.16 | 2.7 | – | – | – | 2.5 | |
| 1375 | – | – | 0.6 | – | – | – | 0.33 | |
| 2884 | – | 4.39 | – | – | – | – | 3.2 | |
| 2975 | – | 10.5 | – | 6.5 | – | – | 14.8 | |
| C3H8 | 2962 | – | 15.8 | – | – | – | – | 15.8 |
Notes.
The A-values in bold refer to literature data that have been used in this work for the calculation of the cross sections. For the other vibration modes, the displayed values (not in bold) were obtained by normalization of N(F) (Sect. 3.2.1). All values are obtained from transmission mode spectroscopy.
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