Holes in Quantum Chemistry
An alternate meaning for the term electron hole is used in computational chemistry. In coupled cluster methods, the ground (or lowest energy) state of a molecule is interpreted as the "vacuum state"—conceptually, in this state there are no electrons. In this scheme, the absence of an electron from a normally-filled state is called a "hole" and is treated as a particle, and the presence of an electron in a normally-empty state is simply called an "electron". This terminology is almost identical to that used in solid-state physics.
Read more about this topic: Electron Hole
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And Father John went down;
And he wore small holes in his shoes,
And he wore large holes in his gown.”
—William Butler Yeats (1865–1939)
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