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Inglis-Teller limit
The linear Stark shift is given by
where e is the elementary charge, radius of the nth electron orbit in the Bohr model of the hydrogen atom and F is the component of the local electric field parallel with the electric dipole. The energy of the nth electron orbit is simply the Coulomb potential energy with r = rn
giving an energy level spacing
The Inglis-Teller limit is defined as the field strength at which the Stark states with |(n1 - n2)| = n are shifted by half of this spacing, ΔES = ΔUn/2,