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Updated: Jun 18, 2026

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
Published on: April 8, 2020
Toward accurate reaction energetics for molecular line growth at surface: Quantum Monte Carlo and density functional
Yosuke Kanai1, Noboru Takeuchi
1Berkeley Nanosciences and Nanoengineering Institute, University of California, Berkeley, Berkeley, California 94720, USA. kanai3@llnl.gov
Abstract:
We revisit the molecular line growth mechanism of styrene on the hydrogenated Si(001)2x1 surface. In particular, we investigate the energetics of the radical chain reaction mechanism by means of diffusion quantum Monte Carlo (QMC) and density functional theory (DFT) calculations. For the exchange correlation (XC) functional we use the nonempirical generalized-gradient approximation (GGA) and meta-GGA. We find that the QMC result also predicts the intra-dimer-row growth of the molecular line over the inter-dimer-row growth, supporting the conclusion based on DFT results. However, the absolute magnitudes of the adsorption/reaction energies and the heights of the energy barriers differ considerably between the QMC and DFT with the GGA/meta-GGA XC functionals.
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