5 papers
The Singlet-Triplet Gap of Cyclobutadiene: The CIPSI-Driven CC(;) Study
Swati S. Priyadarsini, Karthik Gururangan, Jun Shen +1
An accurate determination of singlet-triplet gaps in biradicals, including cyclobutadiene in the automerization barrier region where one has to balance the substantial nondynamical…
Reduced-Cost Four-Component Relativistic Double Ionization Potential Equation-of-Motion Coupled-Cluster Approaches with 4-Hole--2-Particle Excitations and Three-Body Clusters
Tamoghna Mukhopadhyay, Madhubani Mukherjee, Karthik Gururangan +2
The double ionization potential (DIP) equation-of-motion (EOM) coupled-cluster (CC) method with 4-hole--2-particle (4-2) excitations on top of the CC with singles, doubles, a…
Extension of the CC(;) Formalism to the Electron Attachment and Ionization Potential Equation-of-Motion Coupled-Cluster Frameworks
Karthik Gururangan, Stephen H. Yuwono, A. Eugene DePrince +1
We combine the electron attachment (EA) and ionization potential (IP) equation-of-motion (EOM) coupled-cluster (CC) approaches with the CC(;) formalism. The resulting methodo…
Double Ionization Potential Equation-of-Motion Coupled-Cluster Approach with Full Inclusion of 4-Hole-2-Particle Excitations and Three-Body Clusters
Karthik Gururangan, Achintya Kumar Dutta, Piotr Piecuch
The double ionization potential (DIP) equation-of-motion (EOM) coupled-cluster (CC) method with a full treatment of 4-hole-2-particle (4-2) correlations and triply excited cl…
Extension of the Active-Orbital-Based and Adaptive CC(;) Approaches to Excited Electronic States: Application to Potential Cuts of Water
Karthik Gururangan, Jun Shen, Piotr Piecuch
We report the first study using active-orbital-based and adaptive CC(;) approaches to describe excited electronic states. These CC(;) methodologies are applied, alongsi…