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- Franca Maria Floris, Claudia Filippi, Claudio Amovilli
- The Journal of chemical physics
- 2012

We present density functional theory (DFT) and quantum Monte Carlo (QMC) calculations of the glutamic acid and glutamate ion in vacuo and in various dielectric continuum media within the polarizable continuum model (PCM). In DFT, we employ the integral equation formalism variant of PCM while, in QMC, we use a PCM scheme we have developed to include both… (More)

- Claudio Amovilli, Franca Maria Floris
- The journal of physical chemistry. A
- 2015

We present a general method to compute dispersion interaction energy that, starting from London's interpretation, is based on the measure of the electronic electric field fluctuations, evaluated on electronic sampled configurations generated by quantum Monte Carlo. A damped electric field was considered in order to avoid divergence in the variance.… (More)

- Franca Maria Floris, Claudia Filippi, Claudio Amovilli
- The Journal of chemical physics
- 2014

We investigate here the vertical n → π(*) and π → π(*) transitions of s-trans-acrolein in aqueous solution by means of a polarizable continuum model (PCM) we have developed for the treatment of the solute at the quantum Monte Carlo (QMC) level of the theory. We employ the QMC approach which allows us to work with highly correlated electronic wave functions… (More)

- Riccardo Guareschi, Franca Maria Floris, Claudio Amovilli, Claudia Filippi
- Journal of chemical theory and computation
- 2014

We present the first application of quantum Monte Carlo (QMC) in its variational flavor combined with the polarizable continuum model (PCM) to perform excited-state geometry optimization in solution. Our implementation of the PCM model is based on a reaction field that includes both volume and surface polarization charges and is determined self-consistently… (More)

- Claudio Amovilli, Claudia Filippi, Franca Maria Floris
- The Journal of chemical physics
- 2008

We present a novel formulation based on quantum Monte Carlo techniques for the treatment of volume polarization due to quantum mechanical penetration of the solute charge density in the solvent domain. The method allows to accurately solve Poisson's equation of the solvation model coupled with the Schrodinger equation for the solute. We demonstrate the… (More)

- Franca Maria Floris
- The Journal of chemical physics
- 2007

For hard spheres with a radius up to 10 A in TIP4P water under ambient conditions, the author studies how the excess number of molecules at the accessible surface depends on the radius of the cavity. Simulation results derived from excess volumes are discussed in terms of radial distribution functions (rdfs), which compare well with extended simple point… (More)

- Franca Maria Floris
- The journal of physical chemistry. B
- 2005

A new expression to compute the cavitation free energy has been derived by integrating a new model to fit its derivative with respect to the cavity radius. The derivatives were obtained from Monte Carlo simulations data of the contact values of distribution functions for hard-sphere solutes in TIP4P water at 298 K and 1 atm. The new expression, formulated… (More)

- Claudio Amovilli, Franca Maria Floris, Andrea Grisafi
- Computation
- 2016

In this work, we present a simple decomposition scheme of the Kohn-Sham optimized orbitals which is able to provide a reduced basis set, made of localized polycentric orbitals, specifically designed for Quantum Monte Carlo. The decomposition follows a standard Density functional theory (DFT) calculation and is based on atomic connectivity and shell… (More)

- Franca Maria Floris
- The Journal of chemical physics
- 2012

- Riccardo Guareschi, Habiburrahman Zulfikri, +4 authors Claudia Filippi
- Journal of chemical theory and computation
- 2016

We present for the first time a quantum mechanics/molecular mechanics scheme which combines quantum Monte Carlo with the reaction field of classical polarizable dipoles (QMC/MMpol). In our approach, the optimal dipoles are self-consistently generated at the variational Monte Carlo level and then used to include environmental effects in diffusion Monte… (More)