Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 144, Issue 35, Pages 15932-15937Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.2c06357
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Funding
- US National Science Foundation (NSF) [CHE-2102505]
- Simons Foundation
- Air Force Office of Scientific Research [FA9550-18-1-0095]
- German Research Foundation (DFG) [4442/1-1]
- Resnick Sustainability Institute at the California Institute of Technology
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The study introduces a new ab initio simulation method to analyze the potential energy curve and vibrational spectrum of chromium dimer, achieving quantitative agreement with experimental results and providing a theoretical basis for future research on transition metal clusters with spectroscopic accuracy. The research results improve the vibrational assignment of earlier experimental data and offer a new perspective for quantitative quantum chemical modeling.
The complex electronic structure and unusual potential energy curve of the chromium dimer have fascinated scientists for decades, with agreement between theory and experiment so far elusive. Here, we present a new ab initio simulation of the potential energy curve and vibrational spectrum that significantly improves on all earlier estimates. Our data support a shift in earlier experimental assignments of a cluster of vibrational frequencies by one quantum number. The new vibrational assignment yields an experimentally derived potential energy curve in quantitative agreement with theory across all bond lengths and across all measured frequencies. By solving this long-standing problem, our results raise the possibility of quantitative quantum chemical modeling of transition metal clusters with spectroscopic accuracy.
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