The effects of multiperturber interactions on the sodium–rare gas excimer bands

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Abstract
The extreme wing (600<λD lines perturbed by xenon and krypton has been measured in fluorescence at perturber densities between 2×1019 and 3×1020 cm−3. At these perturber densities the observed fluorescence results mostly from the NaXe* (NaKr*) molecule in the wavelength range of 600<λ2* (NaKr2*) molecule in the range 740<λ<820 nm (700 <λ<820 nm). The fluorescence emission coefficient is obtained in normalized units, allowing quantitative comparison to theory. The quasistatic line‐broadening theory, including multiple‐perturber interactions, is used to calculate the density dependence of the spectra which would result from trimer potential surfaces given by scalarly additive pair interactions. This approximation explains some of the observatons; discrepancies between this model and the experimental results are discussed.