Paweł Czachorowski

Faculty of Physics Computer Centre, University of Warsaw

My shady mug

About me

I'm a computer specialist in Faculty of Physics Computer Centre, University of Warsaw (since January 2024). I hold a PhD in physics, specialization in atomic and molecular physics (obtained here, at FUW). Before my doctoral studies, I studied chemistry at NCU in Toruń (focusing on quantum chemistry too), and after the doctorate I spent several years as a post-doc in the Faculties of Chemistry at UW and AMU (Poznań) too.

During my years as a researcher, I've observed that the computational aspect of science is much more fun for me than the actual academic pursuit. Because of that, I've somewhat moved from pure science towards IT. To a large extent, I'm a self-taught free spirit, so I'm always on a lookout to learn something new and exciting.

I'm interested in numerical methods, programming (Fortran, C++), parallel computing, networking, Linux systems and security. If you need help with some IT-related problems, or just want to discuss such topics, feel free to find me.

Research

Currently, I'm employed on an IT position at the Faculty and research is not my priority anymore. I have a background in quantum chemistry and theoretical molecular spectroscopy, though.

My main focus have been highly accurate calculations of energy levels of small chemical entities such as the helium atom or the hydrogen molecule. Their simplicity allows for inclusion of very subtle physical effects – finite-nuclear-mass (adiabatic, nonadiabatic), relativistic, and quantum-electrodynamic. Additionally, a more powerful calculation method can be chosen, like expansion of the wavefunction in a basis set which treats electronic correlation explicitly. In the end, it is possible to obtain a result of accuracy on par with modern spectroscopy, e.g. ten significant digits of dissociation energy of H2. This opens the way for meaningful comparison between the theory and the experiment, serving both as a consistency check and a possible space for looking for new physical phenomena.

I've also dabbled a bit in theoretical metrology, calculating the second virial coefficient for helium. Using an interaction potential between two atoms, it's possible to solve the nuclear problem of such system.

You can see my works below.

Theses

  • Relativistic Nonadiabatic Corrections to the Ground State of Molecular Hydrogen, P. Czachorowski, Faculty of Physics, University of Warsaw 2019, PhD thesis, supervisors: K.Pachucki, M. Puchalski (^this is an updated version with some corrections done after the reviewing process, the original submitted one can be found here)
  • Application of exponentially correlated functions to the hydrogen molecule, P. Czachorowski, Faculty of Chemistry, Nicolaus Copernicus University 2014, MSc thesis, supervisors: D. Kędziera, K. Pachucki
  • Application of Sturmians to many-electron systems, P. Czachorowski, Faculty of Chemistry, Nicolaus Copernicus University 2012, BSc thesis, supervisor: D. Kędziera

Papers

Teaching

My work position does not involve teaching by default. Believing in free flow of knowledge and enjoying meeting curious minds, I opt to teach whenever I can. Here you can find some materials of my current and past courses.

Technologie informacyjne i komunikacyjne

Archive

Materiały do ćwiczeń z przedmiotu „Programowanie II R” (2024):

Materiały do ćwiczeń z przedmiotu „Molekularna mechanika kwantowa” (2017):

Materiały do ćwiczeń z przedmiotu „Molekularna mechanika kwantowa” (2016):

Materiały do ćwiczeń z przedmiotu „Metody matematyczne i obliczeniowe w fizyce” (2014):

Pages of interest

Info

📧Pawel.Czachorowski@fuw.edu.pl
🎓USOS profile page
📃Google Scholar profile
ORCID logohttps://orcid.org/0000-0002-1950-0086
☎(+48)22-55-32-521
🏢Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
🚪1.21
🕑9:00 – 17:00