Auxiliary-field quantum Monte Carlo calculations of the molybdenum dimer
- College of William and Mary, Williamsburg, VA (United States); Old Dominion Univ., Norfolk, VA (United States)
- 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
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