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Updated: Sep 19, 2025

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Modeling the projected range of protons in matter: insights from molecular dynamics and quantum chemistry
Chieh-Min Hsieh1, Alexander Dellwisch1, Tim Neudecker1,2,3
1University of Bremen, Institute for Physical and Theoretical Chemistry, Leobener Str. 6, D-28359 Bremen, Germany. neudecker@uni-bremen.de.
Abstract:
Estimating the projected range of high-energy particles is important for ion implantation and designing shielding strategies for space devices. In this work, we propose a molecular dynamics (MD) workflow to calculate the projected range of protons and demonstrate its capabilities by calculating the projected range of protons in graphite and poly(methyl methacrylate) (PMMA). The results show excellent agreement with reference data. Besides, we investigate irradiation-induced bond breaking by simulating the proton bombardment of a perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) molecule and analyze the strain energy accumulated in the system using quantum chemical tools. The findings indicate a correlation between strain energy and the kinetic energy of the primary knock-on atom.
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