Quantum dynamical and isotopic effects for hydrogen isotope scattering at W(110) surface

Area of Science:

• Surface Science and Physical Chemistry
• Quantum Dynamics and Atomic/Molecular Collisions

Background:

• Understanding gas-surface interactions is crucial for catalysis and materials science.
• The role of quantum effects in scattering processes, particularly for light isotopes, remains an active area of research.

Purpose of the Study:

• To investigate the scattering dynamics of hydrogen isotopes (H, D, T) on the W(110) surface.
• To elucidate the significance of quantum mechanical effects compared to classical dynamics in this system.
• To analyze absorption probabilities and diffraction channels for different isotopes and incident energies.

Main Methods:

• Employed both classical dynamics and quantum dynamics simulations.
• Calculated key observables: absorption probability and diffraction channels.
• Evaluated scattering at quasi-classical and quantum levels for comparative analysis.

Main Results:

• Quantum simulations revealed resonance structures in absorption, attributed to diffraction-mediated selective adsorption and focused sticking.
• Significant quantum effects were observed in diffraction probabilities for reflected trajectories at low incident energies.
• Classical dynamics underestimated backscattering probabilities, with discrepancies persisting across isotopes (H, D, T) at low energies.

Conclusions:

• Quantum dynamics are essential for accurately describing hydrogen isotope scattering on W(110), particularly at low incident energies.
• Diffraction-mediated selective adsorption and focused sticking are key quantum phenomena influencing absorption.
• Classical methods provide insufficient accuracy for backscattering predictions, underscoring the importance of quantum treatments for light isotopes.