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🔍 donald e. ramirez 📂 Chemistry
Showing 461 results for "donald e. ramirez" in Chemistry
Chemistry Preprint PDF DOI

Experimentally Accurate Graph Neural Network Predictions of Core-Electron Binding Energies

Adam E. A. Fouda, Joshua Zhou, Rodrigo Ferreira, Patrick Phillips, Valay Agarawal, Bhavnesh Jangid, Jacob J. Wardzala, Rui Ding, Junhong Chen, Nicole Tebaldi, Phay J. Ho, Laura Gagliardi, Linda Young · 2026

Graph neural network architectures are advantageous for predicting core-electron binding energies which depend on local bond environment effects, as the number of message passing layers defines the to…

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Chemistry Preprint PDF DOI

DeepHartree: A Poisson-Coupled Neural Field for Scalable Density Functional Theory

Jiankun Wu, Jinming Fan, Chao Qian, Shaodong Zhou · 2026

Ab initio calculations are fundamentally bottlenecked for large systems by the steep computational scaling of solving self-consistent field (SCF) equations. While machine learning offers potential acc…

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Chemistry Preprint PDF DOI

Spin-cavity interactions in relativistic Jahn-Teller systems under strong light-matter coupling

Eric W. Fischer, Michael Roemelt · 2026

We extend our recent work on the cavity-modified spin Zeeman effect of an effective spin-1/2-system[J. Chem. Phys. 163, 174307 (2025)] to a relativistic Jahn-Teller scenario under strong light-matter …

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Chemistry Preprint PDF DOI

Integral-equation analysis of transient diffusion-limited currents at disk electrodes: Asymptotic expansion and compact approximation

Kazuhiko Seki, Yuko Yokoyama, Masahiro Yamamoto · 2026

The transient diffusion-limited current at a disk electrode following a change in interfacial ion concentration induced by a potential step is analyzed with direct relevance to chronoamperometric meas…

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Chemistry Preprint PDF DOI

Optical frequency comb Fourier transform spectroscopy of the CH$_2$$^{79}$Br$^{81}$Br, CH$_2$$^{79}$Br$_2$, and CH$_2$$^{81}$Br$_2$ isotopologues in the 1180-1210 cm$^{-1}$ region

Ibrahim Sadiek, Aleksandr A. Balashov, Adrian Hjalten, Michael Rey, Oleg Egorov, Aleksandra Foltynowicz · 2026

Quantitative spectroscopic detection of dibromomethane, CH$_2$Br$_2$, for environmental monitoring, workplace safety, and exoplanetary studies is limited by the lack of accurate absorption cross-secti…

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Chemistry Preprint PDF DOI

Collective Electronic Polarization Drives Charge Asymmetry at Oil-Water Interfaces

Gabriele Amante, Klaudia Mrazikova, Gabriele Centi, Sylvie Roke, Ali Hassanali, Giuseppe Cassone · 2026

Why kinetically stable oil droplets in water spontaneously acquire a negative charge remains one of the most vigorously debated questions in interfacial science. Here, we combine neural-network based …

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Chemistry Preprint PDF DOI

Enhanced Third-Order Optical Nonlinearity in a Dipolar Carbene-Metal-Amide Material with Two-Photon Excited Delayed Fluorescence

Ikechukwu D Nwosu, Lujo Matasovic, Tarcius N Ramos (UNamur), Nguyen Le Phuoc, Giacomo Londi (UniPi), Alexander J Gillett, Daniel T W Toolan, Charles T Smith, George F S Whitehead, Mireille Blanchard-Desce (ISM), Jonathan Daniel (ISM), Mikko Linnolahti (UEF), Yoann Olivier (UNamur), Alexander S Romanov · 2026

Advanced photonic materials showing two-photon absorption (2PA) have been widely explored to develop three-dimensional imaging, micro and nanofabrication, all-optical switching, lithography on a nanos…

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Chemistry Preprint PDF DOI

Projected Hessian Learning: Fast Curvature Supervision for Accurate Machine-Learning Interatomic Potentials

Austin Rodriguez, Justin S. Smith, Sakib Matin, Nicholas Lubbers, Kipton Barros, Jose L. Mendoza-Cortes · 2026

The Hessian matrix (second derivatives) encodes far richer local curvature of the potential energy surface than energies and forces alone. However, training machine-learning interatomic potentials (ML…

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Chemistry Preprint PDF DOI

A Relationship between the Molecular Parity-Violation Energy and the Electronic Chirality Measure

Juan J. Aucar, Alessandro Stroppa, Gustavo A. Aucar · 2026

When the weak-forces producing parity-violating effects are taken into account, there is a tiny energy difference between the total electronic energies of two enantiomers ($\Delta E_{PV}$), which migh…

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Chemistry Preprint PDF DOI

Electron Attachment Induced Shape Resonances in AT Base Pairs

Sneha Arora, Jishnu Narayanan SJ, Achintya Kumar Dutta · 2026

In this work, we investigated the influence of base pairing and {\pi}-{\pi} stacking interactions on electron attachment induced shape resonances in the adenine-thymine (AT) base pair. Resonance posit…

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Chemistry Preprint PDF DOI

Spectral Homogenization of the Radiative Transfer Equation via Low-Rank Tensor Train Decomposition

Y. Sungtaek Ju · 2026

Radiative transfer in absorbing-scattering media requires solving a transport equation across a spectral domain with 10^5 - 10^6 molecular absorption lines. Line-by-line (LBL) computation is prohibiti…

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Chemistry Preprint PDF DOI

Efficient, Equivariant Predictions of Distributed Charge Models

Eric D. Boittier, Markus Meuwly · 2026

A machine learning (ML) based equivariant neural network for constructing distributed charge models (DCMs) of arbitrary resolution, DCM-net, is presented. DCMs efficiently and accurately model the ani…

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Chemistry Preprint PDF DOI

Interpretable Machine Learning for Quantum-Informed Property Predictions in Artificial Sensing Materials

Li Chen, Leonardo Medrano Sandonas, Shirong Huang, Alexander Croy, Gianaurelio Cuniberti · 2026

Digital sensing faces challenges in developing sustainable methods to extend the applicability of customized e-noses to complex body odor volatilome (BOV). To address this challenge, we developed MORE…

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Chemistry Preprint PDF DOI

Maximum Diminished Sombor Index of Molecular Trees with a Perfect Matching

Fei Guo, Fangxia Wang · 2025

The diminished Sombor index $(DSO)$ of a graph $G$, introduced by Rajathagiri, is defined as $$DSO(G)=\sum_{uv\in E}\frac{\sqrt{d_u^2+d_v^2}}{d_u+d_v},$$ where $d_u$ and $d_v$ are the degrees of verti…

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Chemistry Preprint PDF DOI

Measurement and assignment of E-symmetry states in the 6010-6110 cm$^{-1}$ and 8940-9150 cm$^{-1}$ ranges of methane using optical frequency comb double-resonance spectroscopy

Adrian Hjalten, Vinicius Silva de Oliveira, Michael Rey, Isak Silander, Kevin K. Lehmann, Aleksandra Foltynowicz · 2025

We use sub-Doppler optical-optical double-resonance (OODR) spectroscopy with a 3.3 ${\mu}$m single-frequency pump and a cavity-enhanced 1.65 ${\mu}$m comb probe to measure 33 ladder-type (3${\nu}$${_3…

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Chemistry Preprint PDF DOI

On-the-Fly Cavity-Molecular Dynamics of Vibrational Polaritons

Sachith Wickramasinghe, Amirhosein Amini, Arkajit Mandal · 2025

In this work, we combine the density functional tight-binding (DFTB) approach with a light-matter Hamiltonian beyond the long-wavelength approximation to propagate the dynamics of vibrational polarito…

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Chemistry Preprint PDF DOI

Asymmetry and coverage dependence in two-pulse correlation measurements of CO photodesorption from Pd(111): Insights from theory

Raul Bombin, Alberto S. Muzas, Alfredo Serrano Jimenez, J. Inaki Juaristi, Maite Alducin · 2025

Two-pulse correlation experiments performed using pulses of different intensities on Pd(111) with different CO coverages showed that the CO photodesorption probability depends on whether the strong or…

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Chemistry Preprint PDF DOI

Herman-Kluk-Like Semi-Classical Initial-Value Representation for Boltzmann Operator

Binhao Wang, Fan Yang, Chen Xu, Peng Zhang · 2025

The coherent-state initial-value representation (IVR) for the semi-classical real-time propagator of a quantum system, developed by Herman and Kluk (HK), is widely used in computational studies of che…

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Chemistry Preprint PDF DOI

Marcus Theory and The Condon Approximation Revisited I: E-SHAKE and Seam Sampling

D. Vale Cofer-Shabica, Jennifer R. DeRosa, Joseph E. Subotnik · 2025

Marcus theory is the workhorse of theoretical chemistry for predicting the rates of charge and energy transfer. Marcus theory overwhelmingly agrees with experiment -- both in terms of electron transfe…

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Chemistry Preprint PDF DOI

Microscopic Structure of Aqueous Alkylamine mixtures: a Computer Simulation Study

Martina Pozar, Lena Friedrich, Bernarda Lovrincevic, Michael Paulus, Christian Sternemann, Aurelien Perera · 2025

Aqueous alkylamine mixtures are studied by computer simulations in order to understand the microscopic origin of the water rich side prominent x-ray scattering pre-peaks reported in a recent study. Th…

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