This collection explores the fascinating intersection where the laws of physics meet the complex machinery of chemistry. Here, researchers investigate how quantum mechanics governs molecular bonds, how light interacts with matter at the atomic scale, and how fundamental forces shape chemical reactions. It is a realm where abstract mathematical models collide with tangible substances to reveal the hidden mechanisms driving our material world.

On Gist.Science, we process every new preprint in this category directly from arXiv to make these discoveries accessible to everyone. Whether you are a seasoned expert or a curious reader, you will find both plain-language explanations and detailed technical summaries for each paper. Below are the latest contributions from the community pushing the boundaries of physical chemistry.

Enhanced Climbing Image Nudged Elastic Band method with Hessian Eigenmode Alignment

This paper introduces an adaptive hybrid algorithm that integrates the Climbing Image Nudged Elastic Band (CI-NEB) method with Minimum Mode Following (MMF) to accelerate convergence to relevant transition states, demonstrating significant reductions in computational costs for high-throughput automated chemical discovery.

Rohit Goswami (Institute IMX and Lab-COSMO, École polytechnique fédérale de Lausanne, Science Institute, University of Iceland, Reykjavik, Iceland), Miha Gunde (Science Institute, University of (…)2026-04-08🔬 cond-mat.mtrl-sci

Molecular Excited States using Quantum Subspace Methods: Accuracy, Resource Reduction, and Error-Mitigated Hardware Implementation of q-sc-EOM

This study demonstrates that the q-sc-EOM algorithm, enhanced by scaling-reduction techniques and error-mitigation strategies, can accurately compute excited-state potential energy surfaces on near-term quantum hardware, marking a significant step toward practical quantum utility in chemical simulations.

Srivathsan Poyyapakkam Sundar, Prince Frederick Kwao, Alexey Galda, Ayush Asthana2026-04-08⚛️ quant-ph

Rationalizing defect formation energies in metals and semiconductors with semilocal density functionals

This study evaluates various semilocal and hybrid density functionals for calculating defect formation energies in fcc metals and silicon, finding that the local density approximation performs best for metals while the LAK meta-GGA achieves outstanding accuracy for silicon, and rationalizes these trends by analyzing key semilocal ingredients to guide future functional improvements.

Jorge Vega Bazantes, Timo Lebeda, Akilan Ramasamy, Kanun Pokharel, Ruiqi Zhang, John Perdew, Jianwei Sun2026-04-08🔬 cond-mat.mtrl-sci

Two-colour coherent control of nuclear and electron dynamics in photoionization of molecular hydrogen with FEL pulses

This study demonstrates that two-colour (ω\omega-2ω2\omega) coherent control using seeded FERMI free-electron laser pulses can selectively steer the coupled electron-nuclear dynamics in molecular hydrogen photoionization, revealing how relative phases between ionization pathways depend on final vibrational states and are influenced by autoionizing resonances.

Fabian Holzmeier, Alberto Gonzalez-Castrillo, Thomas M. Baumann, Roger Y. Bello, Carlo Callegari, Michele Di Fraia, Matteo Lucchini, Michael Meyer, Oksana Plekan, Kevin C. Prince, Eleonore Roussel, Re (…)2026-04-08🔬 physics

Accessing the performance of CC2 for excited state dynamics: a benchmark study with pyrazine

This study benchmarks the performance of RI-CC2 for ultrafast excited state dynamics in pyrazine by implementing analytical gradients and nonadiabatic couplings in Q-Chem to drive both vibronic coupling models and neural network-accelerated on-the-fly simulations, successfully reproducing experimental population decay times and identifying key vibrational modes and dark state participation in the internal conversion process.

Rui-Hao Bi, Chongxiao Zhao, Ruixin Sun, Wenjie Dou2026-04-08🔬 physics

Does the total energy difference method for modelling core level photoemission fail for bigger molecules?

This study challenges the notion that the Δ\DeltaSCF method fails for larger molecules by demonstrating through new experimental and computational results on anthrone and a 44-molecule dataset that the method accurately predicts core electron binding energies for systems up to 40 atoms.

Marta Berholts, Tanel Käämbre, Arvo Tõnisoo, Rainer Pärna, Vambola Kisand, Juhan Matthias Kahk2026-04-08🔬 physics