At Play With GAMESS (5)

This can be considered a continuation of my playing with the hydronium-water proton transfer as initially displayed here. This also returns somewhat to the Organic Chemistry Lie. In the process of mastering the use of Density Functional Theory (DFT) on GAMESS, I’ve also been playing with a tool called Multi-configuration self-consistent field (MCSCF). One of […]

The Organic Chemistry Lie

Fallout from my learning about Molecular Orbital theory and Hartree-Fock. I’ve said repeatedly that Organic Chemistry is along the spectrum of pursuits that uses Quantum Mechanics. Organic Chemists learn a brutal regimen of details for constructing ball-and-stick models of complicated molecules. I’ve also recently discovered that chemistry –to this day– is teaching a fundamental lie […]

Building a Molecule; Time Spent in the Gap

How is a molecule built? Rather, what exactly is required to predict the electronic structure of a molecule using modern tools? I will use this post to talk about my time spent learning how to apply the classic quantum mechanical calculation of Hartree-Fock (note, this is plain old Hartree-Fock rather than multi-configuration Hartree-Fock or something […]

The Quantum Mechanics in the Gap

A big cat’s paw of mine is trying to fill the space between my backgrounds to understand how one thing leads to another. When a biochemist learns quantum mechanics (QM), it happens from a background where little mathematical sophistication is required; maybe particle-in-a-box appears in the middle of a low grade Physical Chemistry class and […]