Search Results for author: Markus Meuwly

Found 7 papers, 2 papers with code

Outlier-Detection for Reactive Machine Learned Potential Energy Surfaces

no code implementations27 Feb 2024 Luis Itza Vazquez-Salazar, Silvan Käser, Markus Meuwly

Uncertainty quantification (UQ) to detect samples with large expected errors (outliers) is applied to reactive molecular potential energy surfaces (PESs).

Outlier Detection Uncertainty Quantification

Machine Learning Product State Distributions from Initial Reactant States for a Reactive Atom-Diatom Collision System

1 code implementation5 Nov 2021 Julian Arnold, Juan Carlos San Vicente Veliz, Debasish Koner, Narendra Singh, Raymond J. Bemish, Markus Meuwly

Overall, the prediction accuracy as quantified by the root-mean-squared difference $(\sim 0. 003)$ and the $R^2$ $(\sim 0. 99)$ between the reference QCT and predictions of the STD model is high for the test set and off-grid state specific initial conditions and for initial conditions drawn from reactant state distributions characterized by translational, rotational and vibrational temperatures.

The C($^3$P) + O$_2$($^3 Σ_g^-$) $\leftrightarrow$ CO$_2$ $\leftrightarrow$ CO($^1 Σ^+$)+ O($^1$D)/O($^3$P) Reaction: Thermal and Vibrational Relaxation Rates from 15 K to 20000 K

no code implementations11 Mar 2021 Juan Carlos San Vicente Veliz, Debasish Koner, Max Schwilk, Raymond J. Bemish, Markus Meuwly

Thermal rates for the C($^3$P) + O$_2$($^3 \Sigma_g^-$) $\leftrightarrow$ CO($^1 \Sigma^+$)+ O($^1$D)/O($^3$P) reaction are investigated over a wide temperature range based on quasi classical trajectory (QCT) simulations on 3-dimensional, reactive potential energy surfaces (PESs) for the $^1$A$'$, $(2)^1$A$'$, $^1$A$''$, $^3$A$'$ and $^3$A$''$ states.

Chemical Physics

MP2 Is Not Good Enough: Transfer Learning ML Models for Accurate VPT2 Frequencies

no code implementations9 Mar 2021 Silvan Käser, Eric Boittier, Meenu Upadhyay, Markus Meuwly

The calculation of the anharmonic modes of small to medium sized molecules for assigning experimentally measured frequencies to the corresponding type of molecular motions is computationally challenging at sufficiently high levels of quantum chemical theory.

Transfer Learning Chemical Physics

Site-Selective Dynamics of Azidolysozyme

no code implementations12 Feb 2021 Seyedeh Maryam Salehi, Markus Meuwly

Attaching azide to alanine residues can yield dynamics that decays to zero on the few ps time scale (i. e. static component $\Delta_0 \sim 0$ ps$^{-1}$) or to a remaining, static contribution of $\sim 0. 5$ ps$^{-1}$ (corresponding to 2. 5 cm$^{-1}$), depending on the local environment on the 10 ps time scale.

Biological Physics

Reactive Dynamics and Spectroscopy of Hydrogen Transfer from Neural Network-Based Reactive Potential Energy Surfaces

no code implementations21 Nov 2019 Silvan Käser, Oliver T. Unke, Markus Meuwly

It is used to run finite-temperature molecular dynamics simulations, and to determine the infrared spectra and the hydrogen transfer rates for the three molecules.

Chemical Physics

PhysNet: A Neural Network for Predicting Energies, Forces, Dipole Moments and Partial Charges

6 code implementations J. Chem. Theory Comput. 2019 Oliver T. Unke, Markus Meuwly

Further, two new datasets are generated in order to probe the performance of ML models for describing chemical reactions, long-range interactions, and condensed phase systems.

Drug Discovery Formation Energy Chemical Physics

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