
HOMO and LUMO
Highest occupied and lowest unoccupied molecular (frontier) orbitals

Highest occupied and lowest unoccupied molecular (frontier) orbitals
In chemistry, HOMO and LUMO are types of molecular orbitals described at absolute zero. The acronyms stand for highest occupied molecular orbital and lowest unoccupied molecular orbital, respectively. HOMO and LUMO are sometimes collectively called the frontier orbitals, such as in the frontier molecular orbital theory.
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