Tag Archives: Atom

Test Molecules and 3-D Electron Orbitals


NSF – Structures of seven test molecules calculated by the “Direct Self-Consistent-Field” algorithm rewritten to run on a computer’s graphical processing unit (GPU). The numbers indicate how much faster the GPU-ran algorithm calculates the structure of molecules in comparison to a molecular design program called GAMESS running on a computer’s central processing unit. Carbon atoms are aqua, nitrogen atoms are blue, oxygen atoms are red and hydrogen atoms are white.

When designing and simulating molecules, computers can spend long periods of time–ranging from days to years–running the complex mathematical equations (or algorithms) used by scientists and engineers to develop more effective drugs, catalysts for fuel cells and other molecular-based materials and applications. The improved method for running algorithms calculated the structures of test molecules up to 650 times faster than the molecular design program called GAMESS running on a computer’s CPU.

Graphical representation of the olestra test molecule and its highest-occupied 3D electron orbital. The molecular structure was calculated by the “Direct Self-Consistent-Field” algorithm rewritten to run on a computer’s graphical processing unit. Positive and negative regions of the electron orbital are colored blue and orange, respectively. Carbon atoms are aqua, nitrogen atoms are blue, oxygen atoms are red and hydrogen atoms are white. Credit: Ivan S. Ufimtsev, Stanford University more> http://tinyurl.com/cfgbaol

Cluster of gold atoms visualized for the first time


R&D Mag – Scientists at the University of Birmingham have developed a method to visualize gold on the nanoscale by using a special probe beam to image 20 atoms of gold bound together to make a cluster. The research is published this week in the Royal Society of Chemistry’s journal Nanoscale.

Gold is a noble metal which is unreactive and thus resistant to contamination in our every day experience, but at the smallest, nano scale it becomes highly active chemically and can be used as a catalyst for controlling chemical reactions. more> http://tinyurl.com/caoymmm

Bronze-Matryoshka: Metal in a metal in a metal


R&D Mag – This is how Thomas Faessler explains his molecule – Just like in the Russian wooden toy, a hull of twelve copper atoms encases a single tin atom. This hull is, in turn, enveloped by 20 further tin atoms. Professor Faessler’s work group at the Institute of Inorganic Chemistry at the Technische Universitaet Muenchen (TUM) was the first to generate these spatial structures built up in three layers as isolated metal clusters in bronze alloys.

These powders, with their large surfaces, are interesting as an interim step for catalysts that transfer hydrogen, for instance. Similar structures made of silicon could be used in solar cells to capture light from the sun more effectively. more> http://tinyurl.com/8x6txan