Molecular-dynamics study of photodissociation of water in crystalline and amorphous ices.

We present the results of classical dynamics calculations performed to study the photodissociation of water in crystalline and amorphous ice surfaces at a surface temperature of 10 K. A modified form of a recently developed potential model for the photodissociation of a water molecule in ice [S. Andersson et al.

Protons colliding with crystalline ice: proton reflection and collision induced water desorption at low incidence energies.

We present results of classical trajectory (CT) calculations on the sticking of protons to the basal plane (0001) face of crystalline ice, for normal incidence at a surface temperature (Ts) of 80 K. The calculations were performed for moderately low incidence energies (Ei) ranging from 0.05 to 4.

Efficient penetration of the basal plane (0001) face of ice Ih by HF at Ts=150 K: dependence on incidence energy, incidence angle, and rotational energy.

Classical trajectory simulations are carried out to investigate the influence of incidence energy, incidence angle, and rotational energy on the penetration of the basal plane (0001) face of ice I(h) by HF at a surface temperature (T(s)) of 150 K. The interaction of HF with ice is modelled by pair interactions, with the pair potential fitted to ab initio (Hartree-Fock+MP2) calculations. The penetration of ice by HF occurs already at very low incidence energies, viz.