A simple theory is presented describing pressure effects on band lines, insofar as they are due to foreign perturbing molecules without permanent polarity. Results are: Band lines are shifted and broadened much in the manner of atomic lines as a result of van der Waals interactions. Calculations with the models of a rigid rotator and a simple harmonic oscillator, for which formulas are given, show that the effects are practically independent of rotational and vibrational quantum numbers.

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