In situ parameterisation of SCC-DFTB repulsive potentials by iterative Boltzmann inversion

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Development of Accurate and Efficient Electronic Structure Approaches for the Description of Organic Systems

Riccardo Petraglia

The overarching objective of this thesis is extending and adapting the set of computational tools available for describing molecular precursors of organic semiconductors. The research presented within develops adhering to three principle goals: (1) provide ...

EPFL2016

Accuracy of Protein Embedding Potentials: An Analysis in Terms of Electrostatic Potentials

Quantum-mechanical embedding methods have in recent years gained significant interest and may now be applied to predict a wide range of molecular properties calculated at different levels of theory. To reach a high level of accuracy in embedding methods, b ...

Amer Chemical Soc2015

Polarizable Density Embedding: A New QM/QM/MM-Based Computational Strategy

We present a new QM-/QM/MM-based Model for calculating molecular properties and excited states,of solute-solvent systems. We denote this new approach the polarizable density embedding (PDE) model, and represents an extension of our previously developed pol ...

Amer Chemical Soc2015

Generalized QM/MM Force Matching Approach Applied to the 11-cis Protonated Schiff Base Chromophore of Rhodopsin

Ursula Röthlisberger, Ivano Tavernelli, Pablo Campomanes Ramos, Manuel Dömer

We extended a previously developed force matching approach to systems with covalent QM/MM boundaries and describe its user-friendly implementation in the publicly available software package CPMD. We applied this approach to the challenging case of the reti ...

2014

Why are the Interaction Energies of Charge-Transfer Complexes Challenging for DFT?

Anne-Clémence Corminboeuf, Cyril Piemontesi, Aurore Marie-France Delachat

The description of ground state charge-transfer complexes is highly challenging. Illustrative examples include large overestimations of charge-transfer by local and semi-local density functional approximations as well as inaccurate binding energies. It is ...

2012

Efficient evaluation of the accuracy of molecular quantum dynamics on an approximate analytical or interpolated ab initio potential energy surface

Jiri Vanicek, Tomas Zimmermann

Ab initio electronic structure methods have reached a satisfactory accuracy for the calculation of static properties, but remain too expensive for quantum dynamical calculations. Recently, an efficient semiclassical method was proposed to evaluate the accu ...

Wiley-Blackwell2010

Photophysics and Photochemistry from First Principles : Applications to Problems in Materials Science and Biology

Matteo Guglielmi

Quantum chemical methods are important tools for the predictions of electronic structure and energetics of molecules providing the interpretation of spectroscopic experiments and reaction mechanisms. In this thesis, density functional theory (DFT) and wave ...

EPFL2010

A Computational Investigation of Organic Dyes for Dye-Sensitized Solar Cells: Benchmark, Strategies, and Open Issues

Michael Graetzel

A comprehensive theoretical study on the electronic absorption spectra of a representative group of organic dyes (L0, D4, D5, C217, and JK2) employed in dye-sensitized solar cell devices is reported. A benchmark evaluation on different time-dependent densi ...

American Chemical Society2010

BCCFe surface and cluster magnetism using a magnetic potential

Helena Van Swygenhoven

A semi-empirical potential for ferromagnetic bcc iron that also models the co-linear magnetic moment of each atom, has been applied to clusters and surfaces. Surface energies of low index facets, surface relaxation and magnetic moment are calculated and co ...

2007

Magnetoresistive junctions based on epitaxial graphene and hexagonal boron nitride

Alfredo Pasquarello, Oleg Yazyev

We propose monolayer epitaxial graphene and hexagonal boron nitride (h-BN) as ultimate thickness covalent spacers for magnetoresistive junctions. Using a first-principles approach, we investigate the structural, magnetic, and spin transport properties of s ...

2009

Performance of optimized atom-centered potentials for weakly bonded systems using density functional theory

Ursula Röthlisberger, Ivano Tavernelli, Anatole von Lilienfeld

Recently, we have introduced a scheme for optimizing atom-based nonlocal external potentials within the framework of d. functional theory (DFT) in order to systematically improve the description of mol. properties [Phys. Rev. Lett. 93, 153004 (2004); J. Ch ...

2005

Multiple-resonance spectroscopy of high vibrational levels in water and methanol

Pavlo Maksyutenko

We have measured the rovibrational levels in the electronic ground state of the water molecule at the previously inaccessible energies above 26000 cm-1. The use of laser double-resonance overtone excitation combined with laser-induced fluorescence (LIF) ph ...

EPFL2008