https://doi.org/10.1351/goldbook.08591
Influence of terms that are of \(2^{\rm{nd}}\) and higher order in the normal coordinate \(Q\) in the expansion of the electric dipole moment.
Note:
Electrical anharmonicity should not be confused with mechanical anharmonicity.
Electrical anharmonicity should not be confused with mechanical anharmonicity.
See also: electrical harmonicity