Table 3.
Photodissociation parameters in simulated space conditions.
| IR reflectance spectrum of formamide adsorbed by antigorite at 63 K in vacuum | |||||
|---|---|---|---|---|---|
| Peak (cm−1) | Mode | β (min−1) | B | C | R2 |
| 3350–3166 | νas, s NH2 | 0.029 ± 0.005 | 0.87 ± 0.05 | 0.05 ± 0.04 | 0.98 |
| 2891 | ν CH | 0.023 ± 0.005 | 0.46 ± 0.06 | 0.51 ± 0.05 | 0.98 |
| 2473 | ν CO | 0.026 ± 0.008 | 0.75 ± 0.07 | 0.24 ± 0.05 | 0.99 |
| 2329 | ν CO | 0.023 ± 0.004 | 0.84 ± 0.05 | 0.20 ± 0.04 | 0.97 |
| 1750 | ν CO | 0.018 ± 0.009 | 0.6 ± 0.1 | 0.38 ± 0.08 | 0.97 |
| IR reflectance spectrum of formamide adsorbed by TiO2 at 63 K in vacuum | |||||
| Peak (cm−1) | Mode | β (min−1) | B | C | R2 |
| 3298–3166 | νas, s NH2 | 0.17 ± 0.07 | 0.20 ± 0.02 | 0.776 ± 0.011 | 0.9 |
| 2891 | ν CH | 0.08 ± 0.02 | 0.127 ± 0.013 | 0.847 ± 0.007 | 0.94 |
| IR reflectance spectrum of formamide adsorbed by spinel at 63 K in vacuum | |||||
| Peak (cm−1) | Mode | β (min−1) | B | C | R2 |
| 2348 | νas CO2 | 0.305 ± 0.001 | 0.994 ± 0.001 | 0.006 ± 0.001 | 1 |
| 2323 | ν CO | 0.556 ± 0.001 | 0.510 ± 0.001 | 0.490 ± 0.001 | 1 |
| IR reflectance spectrum of formamide adsorbed by forsterite at 63 K in vacuum | |||||
| Peak (cm−1) | Mode | β (min−1) | B | C | R2 |
| 2815 | ... | 0.015 ± 0.010 | 0.054 ± 0.013 | 0.954 ± 0.010 | 0.98 |
| 2771 | ν CH | 0.02 ± 0.02 | 0.15 ± 0.12 | 0.85 ± 0.16 | 0.8 |
| 2474 | ν CO | 0.015 ± 0.008 | 0.040 ± 0.006 | 0.952 ± 0.005 | 0.88 |
Notes. First column: bands that showed variations during the irradiation experiment; second column: vibrational modes; third column: the degradation rate β obtained through Eq. (1); fourth and fifth columns: fraction of molecules that interacted and did not interact with UV radiation respectively (with boundary condition B+C=1); sixth column: R2 points to the goodness of fit with which β was obtained.
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