Comparison of physical processes of atom-surface scattering computed by
classical and quantum dynamics
- URL: http://arxiv.org/abs/2306.17483v3
- Date: Fri, 7 Jul 2023 17:25:18 GMT
- Title: Comparison of physical processes of atom-surface scattering computed by
classical and quantum dynamics
- Authors: Tapas Sahoo
- Abstract summary: We have performed classical and quantum dynamical simulations to calculate quantities for physical processes of atom.
The rate of escaping probability of the scattered particle obtained by classical simulation increases with increasing surface temperature.
The quantum rate is almost temperature independent at 2 meV incident energy of the particle, whereas it shows same trend with the classical results at 5 meV and the quantum rate is lower than the classical rate.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We have performed classical and quantum dynamical simulations to calculate
dynamical quantities for physical processes of atom - surface scattering, e.g.,
trapping probability and average energy loss, final angular distribution of a
particle scattered from a corrugated thermal surface. Here we have restricted
ourselves to in-plane scattering so that only two degrees of freedom of the
particle have to be considered - the vertical distance z and the horizontal
coordinate x. Moreover, we assumed further that only the vertical coordinate
fluctuates due to interaction with thermal phonon bath of the surface. Initial
phase - space variables of the system and the bath for our classical
simulations were generated according to Wigner distribution functions which
were derived from initial wavefunctions of our quantum dynamics. At very low
incident energy, we have found that the quantum mechanical average energy loss
of the escaped particle from the corrugated as well as thermal surface are
smaller than the classical ones at a particular surface temperature. It is
important to note that the rate of escaping probability of the scattered
particle obtained by classical simulation increases with increasing surface
temperature. On the other hand, quantum rate is almost temperature independent
at 2 meV incident energy of the particle, whereas it shows same trend with the
classical results at 5 meV and the quantum rate is lower than the classical
rate. We have also noticed that the final angular distributions of the
scattered particle both for classical as well as quantum dynamics are
qualitatively different but the quantities are more or less temperature
independent.
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