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Wojciech Stark

Wojciech Stark photo

Postgraduate Research Student (joint with Prof. Scott Habershon)

Joined in June 2020.

Project title:

Computational study of nonadiabatic and quantum tunnelling effects in reactive hydrogen chemistry on metals.

About the project:

The unique electronic structure of metals may cause significant differences between classical adiabatic molecular dynamics (MD) and experimental results. Traditionally, molecular dynamics methods utilise the Born-Oppenheimer approximation, which assumes separation of electronic and nuclear degrees of freedom and enables that the nuclear dynamics can be described by a single potential energy surface (PES). However, on metallic surfaces often the energy exchange between adsorbate and surface atoms is significant and causes the breakdown of the Born-Oppenheimer approximation.

There are multiple methods to include such nonadiabatic effects, with one of the most efficient being molecular dynamics with electronic friction (MDEF) [1]. MDEF introduces the non-adiabatic effects by means of both electronic friction and random forces. However, a meaningful comparison between computational simulations and experiments demands the capability to run thousands of MDEF trajectories which are currently unfeasible through ab- initio MD. In this context, machine learning provides a lighter model to compute the electronic friction tensor and the PES allowing to overcome this computational limitation.

Currently, I work on developing machine-learning-based models that enable simulating nonadiabatic molecular dynamics of hydrogen molecules at different copper surfaces.

[1] Head-Gordon, M.; Tully, J. C. J. Chem. Phys. 103, 10137–10145 (1995)

Previous education:

BSc, MSc Chemical Technology and Catalysis (Warsaw University of Technology)