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ReaxFF
Tools | 20 Jun 2011 | Contributor(s):: Michael Russo, Adri van Duin
ReaxFF code for simulating atomic systems
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Chemistry of Transition Metal Alloy Nanoparticles with Desired Phase Properties
Online Presentations | 20 Jun 2011 | Contributor(s):: Lichang Wang
In this presentation, I will discuss the results of two alloy nanoparticles, PtAu and PtVFe. I will also present the synergetic results of unraveling PtVFe nanoparticles by coupling computational chemistry with experimental work.
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ABINIT: First-Time User Guide
Teaching Materials | 09 Jun 2009 | Contributor(s):: Benjamin P Haley
This first-time user guide provides an introduction to using ABINIT on nanoHUB. We include a very brief summary of Density Functional Theory along with a tour of the Rappture interface. We discuss the default simulation (what happens if you don't change any inputs, and just hit...
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Energy and Nanoscience A More Perfect Union
Online Presentations | 27 Mar 2009 | Contributor(s):: Mark Ratner
Huge problems of energy and sustainability confront the science/engineering community, mankind, and our planet. The energy problem comes in many dimensions, including supply, demand, conservation, transportation, and storage. This overview will stress the nature of these problems, and offer a few...
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Facio
Downloads | 25 May 2008 | Contributor(s):: Masahiko Suenaga
Facio is a 3D-graphics program for molecular modeling and visualization of quantum chemical calculations(GAMESS and Gaussian). It is a GUI for FMO (Fragment MO) calculation. Selected features include: (1) From a PDB file, create GAMESS/FMO input with 4 mouse clicks. (2) Manual fragmentation for...
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Northwestern University Initiative for Teaching Nanoscience
Tools | 12 Aug 2008 | Contributor(s):: Baudilio Tejerina
This package allows users to study and analyze of molecular properties using various electronic structure methods.
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Theoretical Electron Density Visualizer
Tools | 01 Jul 2008 | Contributor(s):: Baudilio Tejerina
TEDVis calculates and displays 3D maps of molecular ED and its derivatives from the wave function.
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Ionic Selectivity in Channels: complex biology created by the balance of simple physics
Online Presentations | 05 Jun 2008 | Contributor(s):: Bob Eisenberg
An important class of biological molecules—proteins called ionic channels—conduct ions (like Na+ , K+ , Ca2+ , and Cl− ) through a narrow tunnel of fixed charge (‘doping’). Ionic channels control the movement of electric charge and current across biological membranes...
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Dynamics of Quantum Fluids: Path integral and Semiclassical Methods
Online Presentations | 21 May 2008 | Contributor(s):: Nancy Makri
The interplay of many-body nonlinear interactions and quantum mechanical effects such as zero-point motion or identical particle exchange symmetries lead to intriguing phenomena in low-temperature fluids, some of which remain poorly understood. Recent advances in theory and methodology have...
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Computational Nanoscience, Lecture 20: Quantum Monte Carlo, part I
Teaching Materials | 15 May 2008 | Contributor(s):: Elif Ertekin, Jeffrey C Grossman
This lecture provides and introduction to Quantum Monte Carlo methods. We review the concept of electron correlation and introduce Variational Monte Carlo methods as an approach to going beyond the mean field approximation. We describe briefly the Slater-Jastrow expansion of the wavefunction, and...
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Computational Nanoscience, Lecture 21: Quantum Monte Carlo, part II
Teaching Materials | 15 May 2008 | Contributor(s):: Jeffrey C Grossman, Elif Ertekin
This is our second lecture in a series on Quantum Monte Carlo methods. We describe the Diffusion Monte Carlo approach here, in which the approximation to the solution is not restricted by choice of a functional form for the wavefunction. The DMC approach is explained, and the fixed node...
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Computational Nanoscience, Pop-Quiz
Teaching Materials | 15 May 2008 | Contributor(s):: Elif Ertekin, Jeffrey C Grossman
This quiz summarizes the most important concepts which have covered in class so far related to Molecular Dynamics, Classical Monte Carlo Methods, and Quantum Mechanical Methods.University of California, Berkeley
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Computational Nanoscience, Pop-Quiz Solutions
Teaching Materials | 15 May 2008 | Contributor(s):: Elif Ertekin, Jeffrey C Grossman
The solutions to the pop-quiz are given in this handout.University of California, Berkeley
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UV/Vis Spectra simulator
Tools | 04 Mar 2008 | Contributor(s):: Baudilio Tejerina
This tool computes molecular electronic spectra.
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Calculating Resonances Using a Complex Absorbing Potential
Online Presentations | 13 Mar 2008 | Contributor(s):: Robin Santra
The Siegert (or Gamow) wave function associated with a resonance state is exponentially divergent at large distances from the scattering target. A complex absorbing potential (CAP) provides a computationally simple and efficient technique for calculating the complex Siegert energy of a resonance...
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CNDO/INDO
Tools | 09 Oct 2007 | Contributor(s):: Baudilio Tejerina, Jeff Reimers
Semi-empirical Molecular Orbital calculations.
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Computational Nanoscience, Lecture 4: Geometry Optimization and Seeing What You're Doing
Teaching Materials | 13 Feb 2008 | Contributor(s):: Jeffrey C Grossman, Elif Ertekin
In this lecture, we discuss various methods for finding the ground state structure of a given system by minimizing its energy. Derivative and non-derivative methods are discussed, as well as the importance of the starting guess and how to find or generate good initial structures. We also briefly...
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Exploring Physical and Chemical control of molecular conductance: A computational study
Online Presentations | 31 Jan 2008 | Contributor(s):: Barry D. Dunietz
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Dynamics on the Nanoscale: Time-domain ab initio studies of quantum dots, carbon nanotubes and molecule-semiconductor interfaces
Online Presentations | 31 Jan 2008 | Contributor(s):: Oleg Prezhdo
Device miniaturization requires an understanding of the dynamical response of materials on the nanometer scale. A great deal of experimental and theoretical work has been devoted to characterizing the excitation, charge, spin, and vibrational dynamics in a variety of novel materials, including...
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Perspectives on Computational Quantum Chemistry
Online Presentations | 20 Dec 2007 | Contributor(s):: Martin P. Head-Gordon
This presentation was one of 13 presentations in the one-day forum, "Excellence in Computer Simulation," which brought together a broad set of experts to reflect on the future of computational science and engineering.