energiavahe
Energiavahe (engl. energy gap) is the energy difference between two quantum states of a system. In atoms and molecules this often means the gap between the highest occupied and lowest unoccupied molecular orbitals, or between ground and first excited states. In solid materials, the term most commonly refers to the electronic band gap: the energy difference between the valence-band maximum and the conduction-band minimum.
The size and nature of the energy gap influence a material's electrical conductivity and optical behavior.
Band-gap values are usually expressed in electronvolts (eV) and vary with temperature, pressure and composition. Common
In superconductors the term energy gap also appears as the superconducting gap Δ, the energy required to
In chemistry and molecular physics, the energy gap between frontier orbitals (the HOMO–LUMO gap) influences optical