Table 1
Desorption energy distributions (Edes,dist) (K), Col. 3, of NH2CHO and CH3NH2 obtained in this work with the best-fit pre-exponential factor A values, expressed (s−1).
| Molecule | Substrate | Edes,dist (A) | Edes,max (A) | Edes,max | References |
|---|---|---|---|---|---|
| (A = 1012 s−1) | |||||
| K (s−1) | K (s−1) | K | |||
| NH2CHO | HOPG | 7460–9380 (1018) | 7700 (1018) | 5265 | This work |
| Edes,dist = 5056–6990 | |||||
| NH2CHO | H2O | This work | |||
| NH2CHO | SiO2 | 7397 (1013) | 6871 | Dawley et al. (2014) | |
| CH3NH2 | NH2CH3 | 3010–3490 (1012) | 3307 (1012) | 3307 | This work |
| CH3NH2 | H2O | 3900–4500 (1012) | 4269 (1012) | 4269 | This work |
| CH3NH2 | HOPG | 5050–8420 (1012) | 5100 (1012) | 5100 | This work |
| NH2OH | Silicate | 6518 (1013) | 6080 | Congiu et al. (2012) | |
| CH3OH | CH3OH | 4989 (5 × 1014) | 4169 | Doronin et al. (2015) | |
| CH3OH | H2O | 4366 (2 × 1012) | 4310 | Martín-Doménech et al. (2014) | |
| CH3OH | Graphite | 5454 (1016) | 4257 | Doronin et al. (2015) | |
| H2CO | H2O | 3247 (1013) | 2899 | Noble et al. (2012) | |
| H2CO | Silicate | 3729 (1013) | 3040 | Noble et al. (2012) | |
| H2O | |||||
| Amorphous | Au | 5600 (1015) | 4810 | Fraser et al. (2001) | |
| Crystalline | Au | 5773 (1015) | 4930 | Fraser et al. (2001) | |
Notes. Col. 4 gives the maximum of the desorption energy (Edes,max) (K) obtained with the best-fit pre-exponential factor A values (s−1) for NH2CHO, NH2 CH3, and other astrophysical relevant molecules (NH2OH, CH3 OH, H2 CO, and H2O) taken from the literature. For a comparison, Col. 5 gives the desorption energies (Edes,max) of all the molecules calculated with the typical pre-exponential factor A = 1012 s−1 for various grain surfaces, using Eq. (7) of flux desorption (A1 e −E1,des∕kBT = A2e−E2,des∕kBT), and the values of A and Edes,max in Col. 4.
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