Abstract
The simulation of desorption caused by rapid surface heating, due to irradiation by a laser or electron beam pulse, is described. A stochastic trajectory technique has been used to calculate the translational energy, angular, and residence time distributions of Xe atoms desorbing from a W(100) surface. The relationship between these distribution functions and different parameters used for the heating pulse and the nature of the simulated system are discussed. In particular, the dependence on heating rate, maximum surface temperature, and pulse temporal shape together with the effect of adsorbate-surface potential corrugation and initial surface coverage were studied. In general, it was found that the mean desorbate translational energy is much lower than the surface temperature at the instant of desorption and that the angular distribution is highly peaked towards the surface normal. It is also shown that high adsorbate-surface potential corrugation and attractive adsorbate-adsorbate interaction tends to broaden the desorbate angular distribution.
| Original language | English |
|---|---|
| Pages (from-to) | 3981-3987 |
| Number of pages | 7 |
| Journal | Journal of Chemical Physics |
| Volume | 88 |
| Issue number | 6 |
| DOIs | |
| State | Published - 1 Jan 1988 |
| Externally published | Yes |
ASJC Scopus subject areas
- General Physics and Astronomy
- Physical and Theoretical Chemistry