The energy of the lowest energy level of a molecule that contains no electrons in the ground state, sometimes used as a measure of electrophilicity in QSAR
models.
Note: Also known as the energy of the lowest empty molecular orbital, \(E_{\rm{LEMO}}\).
Source:
PAC, 2016, 88, 239. 'Glossary of terms used in computational drug design, part II (IUPAC Recommendations 2015)' on page 246 (https://doi.org/10.1515/pac-2012-1204)