Abstract
The origin of the fine structure in the wings of the broadened atomic resonance lines of rare gases is discussed. A theoretical model is developed, which enables to ascertain the contributions to absorption by free and bound pairs of rare gas atoms. The quantum-mechanical approach with vibrational-rotational interaction taken into account is employed for bound pairs, and binary quasistatic approximation is used for free pairs. The theory is applied to the computation of the absorption profiles related to the low-energy tail of the first resonance line (1469.60 Å) of gaseous xenon.
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