Time-dependent restricted-active-space self-consistent-field singles method for many-electron dynamics

The time-dependent restricted-active-space self-consistent-field singles (TD-RASSCF-S) method is presented for investigating TD many-electron dynamics in atoms and molecules. Adopting the SCF notion from the muticonfigurational TD Hartree-Fock (MCTDHF) method and the RAS scheme (single-orbital excit...

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Bibliographic Details
Published in:The Journal of chemical physics 2014-04, Vol.140 (16), p.164309-164309
Main Authors: Miyagi, Haruhide, Madsen, Lars Bojer
Format: Article
Language:English
Subjects:
ACCURACY
BERYLLIUM
Convergence
ELECTRON DENSITY
ELECTRONS
HARMONIC GENERATION
Harmonic generations
HARTREE-FOCK METHOD
HELIUM
HYBRIDIZATION
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
Mathematical models
One dimensional models
Orbitals
S waves
SELF-CONSISTENT FIELD
SPECTRA
TIME DEPENDENCE
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Summary:The time-dependent restricted-active-space self-consistent-field singles (TD-RASSCF-S) method is presented for investigating TD many-electron dynamics in atoms and molecules. Adopting the SCF notion from the muticonfigurational TD Hartree-Fock (MCTDHF) method and the RAS scheme (single-orbital excitation concept) from the TD configuration-interaction singles (TDCIS) method, the TD-RASSCF-S method can be regarded as a hybrid of them. We prove that, for closed-shell Ne-electron systems, the TD-RASSCF-S wave function can be fully converged using only Ne/2 + 1 ⩽ M ⩽ Ne spatial orbitals. Importantly, based on the TD variational principle, the converged TD-RASSCF-S wave function with M = Ne is more accurate than the TDCIS wave function. The accuracy of the TD-RASSCF-S approach over the TDCIS is illustrated by the calculation of high-order harmonic generation spectra for one-dimensional models of atomic helium, beryllium, and carbon in an intense laser pulse. The electronic dynamics during the process is investigated by analyzing the behavior of electron density and orbitals. The TD-RASSCF-S method is accurate, numerically tractable, and applicable for large systems beyond the capability of the MCTDHF method.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.4872005