Postdoctoral Fellow in Thermodynamic Modelling and Equations of State in Villigen

# Postdoctoral Fellow in Thermodynamic Modelling and Equations of StatePaul Scherrer Institute (PSI) Villigen, SwitzerlandApplication Deadline: **December 1, 2026**Contract Duration: **limited to 2 years**Employment type: **Full time**Position Type: **PostDoc**Date Posted: **October 30, 2026**Department: **PSI Center for Nuclear Engineering and Sciences**Contact Email: ** **Research Field: **PSI Center for Nuclear Engineering and Sciences**## Project Description### Postdoctoral Fellow in Thermodynamic Modelling and Equations of StateThe Paul Scherrer Institute PSI is the largest research institute for natural and engineering sciences within Switzerland. We perform cutting-edge research in the fields of future technologies, energy and climate, health innovation and fundamentals of nature. By performing fundamental and applied research, we work on sustainable solutions for major challenges facing society, science and economy. PSI is committed to the training of future generations. Therefore, about one quarter of our staff are post-docs, post-graduates or apprentices. Altogether, PSI employs 2300 people. For the Laboratory for Waste Management LES we are looking for aYour tasks* Develop and apply equations of state and activity models for modeling fluid-rock interaction in hydrothermal systems and the mobility of critical elements* Compile, evaluate and interpret experimental thermodynamic data and use physical, statistical and/or machine learning methods to estimate missing model parameters* Contribute to the development and extension of internally consistent thermodynamic databases (e.g. Mines thermodynamic database)* Contribute to the GEMS / ThermoEcos open-source ecosystem (ThermoFun, ThermoExp, GEMS, GEMSFITS)* Collaborate with researchers at PSI and New Mexico Tech (USA), contribute to publications and present results at international conferencesYour profile* PhD degree in geochemistry, physical chemistry, chemical engineering, computational science or a related field, with background in chemical thermodynamics* Experience with scientific programming in Python and/or C++ or demonstrated ability to develop scientific software including the use of AI programming support* Experience with non-linear least-squares fitting, parameter optimisation and uncertainty estimation* Experience with geochemical modelling codes (GEMS, PHREEQC, SUPCRT / SUPCRTBL, Reaktoro, other), the HKF model or density-based EoS and with thermodynamic database development is an advantageWe offerOur institution is based on an interdisciplinary, innovative and dynamic collaboration. You will profit from a systematic training on the job, in addition to personal development possibilities and our pronounced vocational training culture. If you wish to optimally combine work and family life or other personal interests, we are able to support you with our modern employment conditions and the on-site infrastructure. Your employment contract is limited to 2 years. For further information, please contact Dr George-Dan Miron, email Please submit your application online by **1 December 2026** (including list of publications, code and model development, and addresses of referees) for the position as a Postdoctoral Researcher in Thermodynamic Modelling and Equations of State (Index-Nr. ). Paul Scherrer Institute, People & Culture, Serdal Varol, 5232 Villigen PSI, Switzerland
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