Sentences with phrase «free electron pairs»
In this theory, a Lewis acid is any chemical species that attracts free electron pairs.
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Molecules called free radicals have a leftover unpaired electron, an arrangement that makes them highly reactive, eager to pair that remaining electron.
When light shines on a semiconducting material such as TiO2, it generates either free negative (electrons) and positive (holes) charges or a bound neutral electron - hole pair, called an exciton.
The spontaneous conversion of excitons (bound electron - hole pairs) to free carriers via these layer - edge states appears to be the key to improving the photovoltaic and light - emitting thin - film layered materials.
They were able to show that thin films have an intrinsic mechanism for dissociation of the strongly bound electron - hole pairs (excitons) to long - lived free - carriers provided by lower energy states at the edges of the layered perovskites.
This alleviates the quantum traffic jam so that, when the material is cooled to a certain temperature, oppositely aligned electrons (magnetic partners where the «spin» of one electron points up and the adjacent one points down) form pairs and then become free to zip through the material unimpeded - a superconductor.
Free radicals are molecules that contain an unpaired electron and often steal a pair from otherwise balanced molecules in tissues throughout the body.