LATEST NEWS

But how will we solve the manyelectron problem when we cannot connect a laptop to this goddamn screen? https://t.co/mYs42UJOiK

and missing the minus sign from antisymmetry. https://t.co/sdhC7IEJw7

Ya están funcionando estos roboticos repartidores en la U.: https://t.co/BiVCg8uYIW

RT @sapinker: The Why of the World.Theoretical computer scientist Judea Pearl has analyzed the concept of causation & argued it's… https://t.co/PhCeVi3xoP

DFT al revés... https://t.co/Npt56HF00U

Según la misma fuente, habría que agregar: 🇨🇴COL: 88 https://t.co/l9i3UMtmOC

RT @ThamKhaiMeng: This arrow by mathematician and sculptor Kokichi Sugihara can't point left. Here's how it works: It's 3Dprinted wi… https://t.co/Y8twlabrLU

Encuentro entre estudiantes de Colombia y de la Universidad de Purdue para discutir problemas relacionados con la c… https://t.co/HlNEBIM1ul
OUR RESEARCH
PARTITION DENSITY FUNCTIONAL THEORY
We want to understand how chemical concepts arise from basic quantum mechanics. What is the electronegativity of a part of a molecule? What is its chemical hardness? What makes a bond covalent or ionic, and what does that really mean? We are investigating these and other essential questions of theoretical chemistry via a recentlydeveloped Partition Theory, which provides a rigorous way based on Density Functional Theory to divide a molecule into smaller parts.
We impose the constraint that the sum of the electron densities of the parts must be identical to the true density of the entire system. We then minimize the sum of the energies of the parts subject to such density constraint. In the process, an interesting potential (the partition potential) appears as the Lagrange multiplier that guarantees the satisfaction of the density constraint. In work that requires of both, development of formal theory as well as numerical experiments, we are currently investigating general properties of the partition potential, efficient ways to calculate it, implications of the theory, and possible timedependent extensions.
DENSITY RESONANCE THEORY
We like all kinds of resonances. In particular, we want to understand as best as possible the nature of metastable negativeion resonances, and develop firstprinciple techniques to calculate their energies and lifetimes. In spite of being ubiquitous in chemistry, there is no formal theory based on DFT to predict these properties of resonant states. The negative electron affinities measured for many molecules by electron transmission spectroscopy cannot always be accurately calculated via standard DFT. Their importance has been highlighted in recent years due mainly to the role they tend to play as intermediate species during the fragmentation of large molecules upon electron impact at low energies. Efficient treatment of electron correlation effects is essential in such cases, and although this is the specialty of DFT, unbound negative ions lie beyond its current capabilities.