What Does NOONS Stand For?

NOONS stands for Natural Orbitals Occupation Numbers

NOONS, or Natural Orbitals Occupation Numbers, is a quantitative measure used in quantum chemistry to describe the occupancy of natural orbitals in a given electronic state. These occupation numbers provide insight into the distribution of electrons within molecular orbitals, facilitating the analysis of electronic structure and chemical bonding. By focusing on natural orbitals, which represent the most natural basis set for a given electron distribution, NOONS helps researchers to understand and interpret complex quantum systems more intuitively.