Table 6
Comparison between the VUV-absorption cross sections in the 120−160 nm range of all the species in the gas and solid phase.
| Species | Total Int. | Avg. | Ly-α | LBS | 121.6 nm | 157.8 nm | 160.8 nm | |
| [× 10-16 cm2 nm] | [×10-18 cm2] | |||||||
|
|
||||||||
| Solid phase | ||||||||
| CH4 |
|
|
15 | 1.5 |
|
– | – | |
| CO2 |
|
|
1.0 | 3.6 |
|
– | – | |
| N2 | 0.0023 | 0.007 | 0.003 | 0.001 | 0.001 | – | – | |
| O2 |
|
|
1.5 | 5.4 |
|
|
|
|
|
|
||||||||
| Gas phase | ||||||||
| CO2a | 0.15 | 0.33 | – | – | 0.063 | 0.17 | 0.095 | |
| CH4b | 2.9 | 8.2 | – | – | 18 | – | – | |
| N2c | – | – | – | – | – | – | – | |
| O2d | 3.3 | 4.0 | – | – | 2.5 | 6.5 | 4.7 | |
Notes. Total Int. is the total integrated VUV-absorption cross section in this range, Avg. is the average VUV-absorption cross section. Ly-α and LBS are the average VUV-absorption cross sections in the 120.8−122.6 nm and 132−162 nm range normalized by the photon flux. The last three columns are the VUV-absorption cross sections at wavelengths 121.6 nm (corresponding to the maximum intensity of the Ly-α peak), 157.8 and 160.8 nm (main peaks of the Lyman band system). All the VUV-absorption cross-section values in the table need to be multiplied by 1 × 10-18 cm2, as indicated below.
Reference. Raw data adapted from
Lee et al. 32;
Yoshino et al. 68;
Mason et al. 38; and
Lu et al. 36 were used to calculate the reported gas-phase values.
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