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The dominant contribution to the Stark-effect energy of polar  1 Σ diatomic molecules can be calculated from the model of the rigid rotator. Additional terms arise from the anharmonicity of vibration, the centrifugal distortion, the vibration-rotation interaction and the electronic polarizability.

Beiträge zum Stark-Effekt der Moleküle 205 Tl 19 F und 39 K 19 F / Contributions to the Stark-Effect of the Molecules 205 Tl 19 F and 39 K 19 F