Table 5
Comparison between the VUV-absorption cross sections in the 120–160 nm range of all the pure species in the gas and solid (deposited at 8 K) phase.
| Species | Total Int. | Avg. | Ly-α | LBS | 121.6 nm | 157.8 nm | 160.8 nm | ||
| [×10-16 cm2 nm] | [× 10-18 cm2] | ||||||||
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| Solid phase | |||||||||
| CO |
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| H2O |
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| CH3OH |
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| NH3 |
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| H2S |
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| Gas phase | |||||||||
| CO | 2.3 | 20.7 | – | – | – | – | – | ||
| H2O | 2.3 | 3.1 | – | – | 13.6 | 3.2 | 4.1 | ||
| CH3OH | 3.4 | 8.2 | – | – | 13.6 | 8.5 | 10.0 | ||
| NH3 | 2.5 | 6.1 | – | – | 9.8 | 0.1 | 0.3 | ||
| H2S | 10.2 | 31.0 | – | – | 31.0 | 7.9 | 4.9 | ||
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).
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