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A cutoff with wavelength is observed in the absorption of blackbody radiation by free atoms. The cutoff arises from a discontinuity in the density of modes between parallel conducting plates. Absorption at a wavelength of 2/3 cm by atoms between planes 1/3 cm apart is measured at a temperature of 180 K. The discontinuity in the absorption rate occurs when the absorption wavelength is varied across the cutoff of one of the parallel plate modes.
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Vaidyanathan et al. (1981) studied this question.
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