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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 utilize the Born-Oppenheimer approximation, which assumes the separation of electronic and nuclear degrees of freedom and enables nuclear dynamics to be described by a single potential energy surface (PES). However, on metallic surfaces, the energy exchange between adsorbate and surface atoms is often significant and causes the breakdown of the Born-Oppenheimer approximation.

MD on metal surfaces

There are multiple methods to include such nonadiabatic effects, with one of the most efficient being molecular dynamics with electronic friction (MDEF) [Head-Gordon et al. JCP 1995]. 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 us to overcome this computational limitation.

I currently work on developing ML-based models that enable the simulation of adiabatic and nonadiabatic molecular dynamics of hydrogen molecules at different copper surfaces.

cu model

Previous education:

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


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