chemistry, HOMO and LUMO are types of molecularorbitals. The acronyms stand for highest occupied molecularorbital and lowest unoccupied molecularorbital, respectively
region. The terms atomic orbital and molecularorbital were introduced by Robert S. Mulliken in 1932 to mean one-electron orbital wave functions. At an elementary
called the highest occupied molecularorbital (HOMO) and the empty MO just above it is then the lowest unoccupied molecularorbital (LUMO). The electrons in
wolfhound in Victor Hugo's novel The Man Who Laughs HOMO, in chemistry, highest occupied molecularorbitalHomO, the Swedish Ombudsman against Discrimination