Related Experiment Video
Updated: Jul 2, 2026

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
Published on: May 27, 2020
Parallel Fock matrix construction program for molecular orbital calculation--specific computer with a hierarchical
Hiroaki Umeda1, Yuichi Inadomi, Hiroaki Honda
1Research Institute for Computational Sciences, National Institute of Advanced Industrial Science and Technology, Umezono 1-1-1, Tsukuba, Ibaraki, Japan. h-umeda@aist.go.jp
Abstract:
A parallel Fock matrix construction program for a hierarchical network has been developed on the molecular orbital calculation-specific EHPC system. To obtain high parallelization efficiency on the hierarchical network system, a multilevel dynamic load-balancing scheme was adopted, which provides equal load balance and localization of communications on a tree-structured hierarchical network. The parallelized Fock matrix construction routine was implemented into a GAMESS program on the EHPC system, which has a tree-structured hierarchical network. Benchmark results on a 63-processor system showed high parallelization efficiency even on the tree-structured hierarchical network.
Related Concept Videos
Molecular Orbital Theory I
Hybridization of Atomic Orbitals II
Hybridization of Atomic Orbitals I
MO Theory and Covalent Bonding
Molecular Orbital Theory II
Hückel's Rule Diagram of π MOs: Frost Circle
A Frost circle is constructed by drawing a polygon whose number of edges is equal to the number of carbons of the given cyclic system, with one of the vertices pointing down. Then, a circle is drawn enclosing the polygon so that...

