Schrodinger used first order perturbation techniques to calculate the energies associated with the linear part of this effect, while second order perturbation theory is needed to account for its quadratic part.
Inglis and Teller used this effect to derive a namesake equation relating the principal quantum number to electron density. Another version of this effect that occurs with a strong  laser is known as the Autler-Townes effect. Schrodinger used first order perturbation techniques to calculate the energies associated with the linear part of this effect, while second order perturbation theory is needed to account for its quadratic part. Sometimes named for Lo Surdo and somewhat analogous to the Zeeman effect, for ten points, identify this effect whereby spectral lines are split in the presence of an electric field.
Inglis and Teller used this effect to derive a namesake equation relating the principal quantum number to electron density.
{Stark} effect