The sticking probability of a hydrogen atom on icy mantle.
In the present work, we investigate the sticking process of a hydrogen atom on the surface of dust grains. As a realistic model for the icy mantle of dust grains, we produced slab-shaped amorphous water ice with infinite area by classical molecular dynamics (MD) computational simulation using two-dimensional periodic boundary condition. The resulting amorphous water ice slabs at 10 K and 70 K were found to be in good agreement with the experimental high-density and low-density amorphous water ice, respectively. Then, we investigated the dynamical behaviors of an impinging H atom on the surface of it by MD simulations. The sticking probabilities of incident H atoms with several initial temperatures on 10 K and 70 K ice were obtained. It was found that most of H atoms colliding with the 10 K ice stuck on the surface of it. After having stuck, the impinging H atoms diffused on the surface of ice and became trapped in one of potential wells on the surface. The mobility of a H atom on the surface of the amorphous water ice was found to depend only upon the temperature of ice.
Masuda
K
K
The Graduate School of Science and Technology, Kobe University, Japan.
Takahashi
J
J
D003198:Computer Simulation; D019443:Cosmic Dust; D005118:Extraterrestrial Environment; D006859:Hydrogen / Q000032:analysis / Q000737:chemistry*; D007053:Ice; D008956:Models, Chemical; D010100:Oxygen / Q000032:analysis / Q000737:chemistry; D013696:Temperature; D014867:Water / Q000737:chemistry
D019443:Cosmic Dust; D007053:Ice; D014867:Water; D006859:Hydrogen; D010100:Oxygen