# AIMNet2: a neural network potential to meet your neutral, charged, organic, and elemental-organic needs

“AIMNet2: a neural network potential to meet your neutral, charged, organic, and elemental-organic needs” (2025), by Dylan M. Anstine et al. Physics and Astronomy research paper. Original abstract below, unchanged. No free PDF was found.

- Authors: Dylan M. Anstine, R.I. Zubatyuk, Olexandr Isayev
- Published: January 1, 2025
- Field: Physics and Astronomy
- DOI: https://doi.org/10.1039/d4sc08572h
- Source: https://doi.org/10.1039/d4sc08572h

## Abstract

Machine learned interatomic potentials (MLIPs) are reshaping computational chemistry practices because of their ability to drastically exceed the accuracy-length/time scale tradeoff. Despite this attraction, the benefits of such efficiency are only impactful when an MLIP uniquely enables insight into a target system or is broadly transferable outside of the training dataset, where models achieving the latter are seldom reported. In this work, we present the 2nd generation of our atoms-in-molecules neural network potential (AIMNet2), which is applicable to species composed of up to 14 chemical elements in both neutral and charged states, making it a valuable model for modeling the majority of non-metallic compounds. Using an exhaustive dataset of 20 million hybrid quantum chemical calculations, AIMNet2 combines ML-parameterized short-range and physics-based long-range terms to attain generalizability that reaches from simple organics to diverse molecules with “exotic” element-organic bonding. We show that AIMNet2 outperforms semi-empirical GFN-xTB and is on par with reference density functional theory for interaction energy contributions, conformer search tasks, torsion rotation profiles, and molecular-to-macromolecular geometry optimization. Overall, the demonstrated chemical coverage and computational efficiency of AIMNet2 is a significant step toward providing access to MLIPs that avoid the crucial limitation of curating additional quantum chemical data and retraining with each new application.

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