User profiles for Omar Valsson
Omar ValssonUniversity of North Texas Verified email at unt.edu Cited by 2869 |
Enhancing important fluctuations: Rare events and metadynamics from a conceptual viewpoint
Atomistic simulations play a central role in many fields of science. However, their usefulness
is often limited by the fact that many systems are characterized by several metastable states …
is often limited by the fact that many systems are characterized by several metastable states …
Enhanced sampling methods for molecular dynamics simulations
Enhanced sampling algorithms have emerged as powerful methods to extend the utility of
molecular dynamics simulations and allow the sampling of larger portions of the configuration …
molecular dynamics simulations and allow the sampling of larger portions of the configuration …
Promoting transparency and reproducibility in enhanced molecular simulations
Molecular dynamics (MD) simulations have become an important tool for characterizing
mechanisms underlying complex processes, interpreting experimental measurements, and …
mechanisms underlying complex processes, interpreting experimental measurements, and …
Variational approach to enhanced sampling and free energy calculations
O Valsson, M Parrinello - Physical review letters, 2014 - APS
The ability of widely used sampling methods, such as molecular dynamics or Monte Carlo
simulations, to explore complex free energy landscapes is severely hampered by the …
simulations, to explore complex free energy landscapes is severely hampered by the …
Electronic excitations of simple cyanine dyes: reconciling density functional and wave function methods
R Send, O Valsson, C Filippi - Journal of chemical theory and …, 2011 - ACS Publications
The simplest cyanine dye series [H 2 N(CH) n NH 2 ] + with n = 1, 3, 5, 7, and 9 appears to
be a challenge for all theoretical excited-state methods since the experimental spectra are …
be a challenge for all theoretical excited-state methods since the experimental spectra are …
Photoisomerization of model retinal chromophores: insight from quantum monte carlo and multiconfigurational perturbation theory
O Valsson, C Filippi - Journal of Chemical Theory and …, 2010 - ACS Publications
We present a systematic investigation of the structural relaxation in the excited state of
model retinal chromophores in the gas phase using the complete-active-space self-consistent …
model retinal chromophores in the gas phase using the complete-active-space self-consistent …
Enhancing entropy and enthalpy fluctuations to drive crystallization in atomistic simulations
Crystallization is a process of great practical relevance in which rare but crucial fluctuations
lead to the formation of a solid phase starting from the liquid. As in all first order first …
lead to the formation of a solid phase starting from the liquid. As in all first order first …
Rhodopsin absorption from first principles: Bypassing common pitfalls
Bovine rhodopsin is the most extensively studied retinal protein and is considered the
prototype of this important class of photosensitive biosystems involved in the process of vision. …
prototype of this important class of photosensitive biosystems involved in the process of vision. …
State-specific embedding potentials for excitation-energy calculations
Embedding potentials are frequently used to describe the effect of an environment on the
electronic structure of molecules in larger systems, including their excited states. If such …
electronic structure of molecules in larger systems, including their excited states. If such …
Frequency adaptive metadynamics for the calculation of rare-event kinetics
The ability to predict accurate thermodynamic and kinetic properties in biomolecular systems
is of both scientific and practical utility. While both remain very difficult, predictions of …
is of both scientific and practical utility. While both remain very difficult, predictions of …