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Title: Auxiliary-field quantum Monte Carlo calculations of the molybdenum dimer

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4954245· OSTI ID:1467572
ORCiD logo [1];  [2];  [2]
  1. College of William and Mary, Williamsburg, VA (United States); Old Dominion Univ., Norfolk, VA (United States)
  2. College of William and Mary, Williamsburg, VA (United States)

Chemical accuracy is difficult to achieve for systems with transition metal atoms. Third row transition metal atoms are particularly challenging due to strong electron-electron correlation in localized d-orbitals. The Cr2 molecule is an outstanding example, which we previously treated with highly accurate auxiliary-field quantum Monte Carlo (AFQMC) calculations. Somewhat surprisingly, computational description of the isoelectronic Mo2 dimer has also, to date, been scattered and less than satisfactory. We present high-level theoretical benchmarks of the Mo2 singlet ground state (X1Σ+g) and first triplet excited state (a3Σ+u), using the phaseless AFQMC calculations. Extrapolation to the complete basis set limit is performed. Furthermore, excellent agreement with experimental spectroscopic constants is obtained. We also present a comparison of the correlation effects in Cr2 and Mo2.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); UT-Battelle LLC, Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725; FG02-09ER16046; FG02-11ER16257
OSTI ID:
1467572
Alternate ID(s):
OSTI ID: 1259372
Journal Information:
Journal of Chemical Physics, Vol. 144, Issue 24; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Cited By (6)

Ab initio computations of molecular systems by the auxiliary-field quantum Monte Carlo method journal May 2018
Communication: Calculation of interatomic forces and optimization of molecular geometry with auxiliary-field quantum Monte Carlo journal May 2018
Open-shell coupled-cluster valence-bond theory augmented with an independent amplitude approximation for three-pair correlations: Application to a model oxygen-evolving complex and single molecular magnet journal December 2018
Open-Shell Coupled-Cluster Valence-Bond Theory Augmented with an Independent Amplitude Approximation for Three-Pair Correlations: Application to a Model Oxygen-Evolving Complex and Single Molecular Magnet text January 2018
Accurate computations of Rashba spin-orbit coupling in interacting systems: From the Fermi gas to real materials journal May 2019
On Achieving High Accuracy in Quantum Chemical Calculations of 3d Transition Metal Systems: A Comparison of Auxiliary-Field Quantum Monte Carlo with Coupled Cluster, Density Functional Theory, and Experiment for Diatomic Molecules text January 2019

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