19 citations · 50 across the 14 of their papers we have counts for
16 papers
Coupled Cluster Amplitude Extrapolation in Geometry Optimization
Jonas Beck, Michele Nottoli, Tommaso Nottoli +3
In this work, we present an amplitude extrapolation ansatz for geometry optimization that uses calculations from previous steps to construct an initial guess for the quasi-Newton s…
Use of Cholesky decomposition in the CFOUR program package
Jürgen Gauss, Simon Blaschke, Sophia Burger +10
An overview is given about our efforts to speed up high-level computations of molec- ular energies and properties using Cholesky decomposition (CD). We describe the cor- responding…
Critical point search and linear response theory for computing electronic excitation energies of molecular systems. Part II. CASSCF
Laura Grazioli, Yukuan Hu, Tommaso Nottoli +2
The computation of excited states within the Complete Active Space Self-Consistent Field (CASSCF) framework remains a significant challenge in quantum chemistry, both theoretically…
A novel implementation of CCSD analytic gradients using Cholesky decomposition of the two-electron integrals and Abelian point-group symmetry
Luca Melega, Tommaso Nottoli, Jürgen Gauss +1
We present a novel and efficient implementation of coupled-cluster with singles and doubles (CCSD) analytic gradients that combines the Cholesky decomposition (CD) of electron-repu…
A polarizable CASSCF/MM approach using the interface between OpenMMPol library and CFour
Tommaso Nottoli, Mattia Bondanza, Filippo Lipparini +1
We present a polarizable embedding quantum mechanics/molecular mechanics (QM/MM) framework for ground- and excited-state Complete Active Space Self-Consistent Field (CASSCF) calcul…
Cholesky decomposition in spin-free Dirac-Coulomb coupled-cluster calculations
Tereza Uhlířová, Davide Cianchino, Tommaso Nottoli +2
We present an implementation for the use of Cholesky decomposition (CD) of two-electron integrals within the spin-free Dirac-Coulomb (SFDC) scheme that enables to perform high-accu…
Geometric Optimization of Restricted-Open and Complete Active Space Self-Consistent Field Wavefunctions
Laurent Vidal, Tommaso Nottoli, Filippo Lipparini +1
We explore Riemannian optimization methods for Restricted-Open-shell Hartree-Fock (ROHF) and Complete Active Space Self-Consistent Field (CASSCF) methods. After showing that ROHF a…
MBE-CASSCF Approach for the Accurate Treatment of Large Active Spaces
Jonas Greiner, Ivan Gianni, Tommaso Nottoli +3
We present a novel implementation of the complete active space self-consistent field (CASSCF) method that makes use of the many-body expanded full configuration interaction (MBE-FC…
The OpenMMPol Library for Polarizable QM/MM Calculations of Properties and Dynamics
Mattia Bondanza, Tommaso Nottoli, Michele Nottoli +3
We present a new library designed to provide a simple and straightforward way to implement QM/AMOEBA and other polarizable QM/MM methods based on induced point dipoles. The library…
A novel coupled-cluster singles and doubles implementation that combines the exploitation of point-group symmetry and Cholesky decomposition of the two-electron integrals
Tommaso Nottoli, Jürgen Gauss, Filippo Lipparini
A novel implementation of the coupled-cluster singles and doubles (CCSD) approach is presented that is specifically tailored for the treatment of large, symmetric systems. It fully…
CASSCF response equations revisited: a simple and efficient iterative algorithm
Riccardo Alessandro, Ivan Giannì, Federica Pes +2
We present an algorithm to solve the CASSCF linear response equations that is both simple and efficient. The algorithm makes use of the well established symmetric and antisymmetric…
A robust, open-source implementation of the locally optimal block preconditioned conjugate gradient for large eigenvalue problems in quantum chemistry
Tommaso Nottoli, Ivan Giannì, Antoine Levitt +1
We present two open-source implementations of the Locally Optimal Block Preconditioned Conjugate Gradient (LOBPCG) algorithm to find a few eigenvalues and eigenvectors of large, po…
Computation of NMR shieldings at the CASSCF level using gauge-including atomic orbitals and Cholesky decomposition
Tommaso Nottoli, Sophia Burger, Stella Stopkowicz +2
We present an implementation of coupled-perturbed complete active space self-consistent field (CP-CASSCF) theory for the computation of nuclear magnetic resonance chemical shifts u…
Cholesky decomposition of two-electron integrals in quantum-chemical calculations with perturbative or finite magnetic fields using gauge-including atomic orbitals
Jürgen Gauss, Simon Blaschke, Sophia Burger +3
A rigorous analysis is carried out concerning the use of Cholesky decomposition (CD) of two-electron integrals in the case of quantum-chemical calculations with finite or perturbat…
A black-box, general purpose quadratic self-consistent field code with and without Cholesky Decomposition of the two-electron integrals
Tommaso Nottoli, Jürgen Gauss, Filippo Lipparini
We present the implementation of a quadratically convergent Self-consistent field (QCSCF) algorithm based on an adaptive trust-radius optimization scheme for restricted open-shell…
A Second-Order CASSCF Algorithm with the Cholesky Decomposition of the Two-Electron Integrals
Tommaso Nottoli, Jürgen Gauss, Filippo Lipparini
In this contribution, we present the implementation of a second-order CASSCF algorithm in conjunction with the Cholesky decomposition of the two-electron repulsion integrals. The a…