Analytic energy gradients for the two‐determinant coupled cluster method with application to singlet excited states of butadiene and ozone

1994 ◽  
Vol 101 (6) ◽  
pp. 4936-4944 ◽  
Author(s):  
Péter G. Szalay ◽  
Rodney J. Bartlett
Keyword(s):  
Excited States ◽  
Cluster Method ◽  
Coupled Cluster ◽  
Coupled Cluster Method

The Fock-Space Coupled-Cluster Method in the Calculation of Excited State Properties

2005 ◽  
Vol 70 (6) ◽  
pp. 811-825 ◽  
Author(s):  
Monika Musiał ◽  
Leszek Meissner
Keyword(s):  
Experimental Data ◽  
Excited States ◽  
Fock Space ◽  
Hamiltonian Formulation ◽  
Basis Sets ◽  
Cluster Method ◽  
Coupled Cluster ◽  
Coupled Cluster Method ◽  
Excitation Energies ◽  
Equilibrium Geometries

Our recently developed intermediate Hamiltonian Fock-space coupled-cluster (FS-CC) method with singles and doubles is applied to calculation of equilibrium geometries, harmonic frequencies and adiabatic excitation energies for some excited states of N2 and CO. Due to the intermediate Hamiltonian formulation, which provides a robust computational scheme for solving the FS-CC equations, and the efficient factorization strategy, relatively large basis sets and reference spaces are employed permitting a comparison of calculated properties with experimental data.

Electronic Spectra and Ionization Potentials of Halogen Oxides Using the Fock Space Coupled-Cluster Method

2005 ◽  
Vol 70 (7) ◽  
pp. 851-863 ◽  
Author(s):  
Nayana Vaval ◽  
Prashant Manohar ◽  
Sourav Pal
Keyword(s):  
Excited States ◽  
Fock Space ◽  
Ionization Potentials ◽  
Cluster Method ◽  
Coupled Cluster ◽  
Coupled Cluster Method ◽  
Excitation Energies ◽  
Coupled Cluster Theory ◽  
Vertical Detachment Energy ◽  
Halogen Oxides

The ionization potentials and excitation energies of halogen monoxides and dihalogen oxides are studied using fully size-extensive Fock space version of multi-reference coupled-cluster theory. The low-lying excited states of ClO-, FO-, Cl2O and F2O are obtained along with the ionization spectra of Cl2O and F2O. The adiabatic electron affinity of ClO, FO and the vertical detachment energy of ClO- and FO- are also presented.

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