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.

Spin State versus Potential of Zero Charge as Predictors of Density-Dependent Oxygen Reduction in M-N-C Electrocatalysts

This study demonstrates that the potential of zero charge (PZC), rather than spin state, is the superior predictor for density-dependent oxygen reduction activity and selectivity in M-N-C electrocatalysts, as PZC-driven shifts in the interfacial electric field modulate adsorption energetics to explain performance trends across varying metal-site densities.

Di Zhang, Zixun Yu, Fangzhou Liu, Yumeng Li, Jiaxiang Chen, Xun Geng, Yuan Chen, Li Wei, Hao Li2026-04-21🔬 cond-mat.mtrl-sci

Ice as a Photochemical Shield: Adsorption Energetics and Spectroscopic Modulation of Interstellar Thiocyanates HCSCN and HCSCCH in TMC-1

This study combines computational modeling and astrochemical simulations to reveal that while amorphous solid water ice shields interstellar thiocyanates HCSCN and HCSCCH from thermal desorption through strong binding, it simultaneously creates a "survival paradox" where these deeply trapped molecules become more vulnerable to photodissociation due to enhanced UV absorption cross-sections.

Saptarshi G. Dastider, Amit Singh Negi, Krishnakanta Mondal, Jobin Cyriac2026-04-21🔭 astro-ph

State-Averaged Quantum Algorithms for Multiconfigurational Surface Chemistry: A Benchmark on Rh@TiO2(110)

This paper benchmarks state-averaged quantum algorithms on a Rh-doped TiO2(110) surface catalytic system, demonstrating that the adaptive SA-ADAPT ansatz achieves near-CASSCF accuracy with significantly fewer parameters and faster convergence compared to the state-averaged factorized unitary coupled cluster (SA-fUCCSD) approach.

Ernst Dennis Lægteskov Binau Larsson, Erik Kjellgren, Peter Reinholdt, Jacob Kongsted2026-04-21⚛️ quant-ph

Shannon and Rényi entropies of molecular densities: insights into extensivity and the incomplete description of electron correlation

This paper demonstrates that Shannon and Rényi entropies derived from electron densities and shape functions are unreliable descriptors of static electron correlation and extensivity, as they fail to accurately encode correlation effects and often violate extensivity, suggesting that robust entropic measures must instead be constructed from higher-dimensional Hilbert-space objects.

Diogo J. L. Rodrigues, Evelio Francisco, Ángel Martín Pendás2026-04-21⚛️ quant-ph

Assessment of S* in the Orange Carotenoid Protein

This study demonstrates that the long-lived carotenoid singlet excited state (S*) is not required for the photoconversion of the Orange Carotenoid Protein from its inactive to active form, but rather arises from ground-state heterogeneity within the protein.

James P. Pidgeon, George A. Sutherland, Matthew S. Proctor, Shuangqing Wang, Dimitri Chekulaev, Sayantan Bhattacharya, Rahul Jayaprakash, Andrew Hitchcock, Ravi Kumar Venkatraman, Matthew P. Johnson (…)2026-04-20🔬 physics

Some challenges of diffused interfaces in implicit-solvent models

This study investigates the impact of diffuse interface representations in implicit-solvent models, revealing that while a hyperbolic tangent function with an optimal steepness parameter (kp3k_p \approx 3) improves solvation energy accuracy, binding free energy predictions remain highly sensitive to this parameter, necessitating values between 2 and 20.

Mauricio Guerrero-Montero, Michal Bosy, Christopher D. Cooper2026-04-20🔬 physics

Electron transfer in confined electromagnetic fields: a unified Fermi's golden rule rate theory and extension to lossy cavities

This paper presents a unified Fermi's golden rule rate theory for nonadiabatic electron transfer in confined electromagnetic fields that remains valid across all temperature and cavity time scales, extends to lossy cavities via an effective spectral density, and demonstrates key phenomena such as resonance-enhanced rates and electron-transfer-induced photon emission.

Wenxiang Ying, Abraham Nitzan2026-04-20🔬 physics

SeQuant Framework for Symbolic and Numerical Tensor Algebra. I. Core Capabilities

SeQuant is an open-source library that employs a novel graph-theoretic tensor network canonicalizer to unify symbolic and numerical tensor algebra, enabling efficient handling of complex expressions involving symmetries, non-commutative operators, and parametric mode dependencies for applications in quantum simulation and data science.

Bimal Gaudel, Robert G. Adam, Ajay Melekamburath, Conner Masteran, Nakul Teke, Azam Besharatnik, Andreas Köhn, Edward F. Valeev2026-04-20⚛️ quant-ph