for the line intensities, which were a decided improvement over Kramers's results obtained by the old quantum theory.

While the first-order (linear) Stark effect in hydrogen is in agreement with both the old Bohr-Sommerfeld model and the quantum-mechanical theory of the atom, higher-order corrections are not. Measurements of the Stark effect under high field strengths confirmed the correctness of the new quantum theory.

Mechanism

Overview

Imagine an atom with occupied

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