Table 1
Mass of the observed species, the corresponding electron impact cross-section, and calculated relative sputtering yield off the surface of the comet.
| Species | Mass/charge | Electron-impact cross section | Relative sputtering yield | Surface binding energy, Eb | ||||
|
|
||||||||
| Sodium (Na) | 22.9892 u/e | 2.6 Å2 (Fujii and Srivastava 1995) | 0.197 | 2.0 eV | ||||
| Silicon (Si) | 27.9764 u/e | 6.5 Å2 (Freund et al. 1990) | 0.0613 | 4.7 eV | ||||
| Potassium (K) | 38.9632 u/e | 5.2 Å2 (Borovik 2012) | 0.180 | 0.93 eV | ||||
| Calcium (Ca) | 39.9620 u/e | 6.5 Å2 (Vainshtein et al. 1972) | 0.161 | 2.1 eV | ||||
Notes. Sputter yields are given for a solar wind velocity of 440 km s-1 and a solar wind composition of 95% H and 5% He. The masses have been taken from Haynes (2013) and the mass per charge of the corresponding ion has been calculated by subtracting the mass of the missing electron.
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