期刊
JOURNAL OF CHEMICAL PHYSICS
卷 146, 期 23, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4986950
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资金
- U.S. Department of Energy, Office of Science, Office of Advanced Scientific Computing Research and Scientific Discovery through Advanced Computing (SciDAC) program
- U.S. Department of Energy [DE-AC02-05CH11231]
The method of complex basis functions is applied to molecular resonances at correlated levels of theory. Moller-Plesset perturbation theory at second order and equation-of-motion electron attachment coupled-cluster singles and doubles (EOM-EA-CCSD) methods based on a non-Hermitian self-consistent-field reference are used to compute accurate Siegert energies for shape resonances in small molecules including N-2(-), CO-, CO2-, and CH2O-. Analytic continuation of complex theta-trajectories is used to compute Siegert energies, and the theta-trajectories of energy differences are found to yield more consistent results than those of total energies. The ability of such methods to accurately compute complex potential energy surfaces is investigated, and the possibility of using EOM-EA-CCSD for Feshbach resonances is explored in the context of e-helium scattering. Published by AIP Publishing.
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