The group theoretical analysis of the electronic structure of l,4-dihydro-l,4-bis (dicyanoinethylene)triptycene leads to an interesting but rarely documented notion, "charge transfer transition for symmetry forbidden charge transfer interaction" , which was supported by the substituent effects on the charge transfer band shifts. The substituent effects on the charge transfer band shifts were al...

We study the minimum energy configuration of a uniform distribution of negative charge subject to Coulomb repulsive self-interaction and attractive interaction with a fixed positively charged domain. After having established existence and uniqueness of a minimizing configuration, we prove charge neutrality and the complete screening of the Coulomb potential exerted by the positive charge, and w...