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We have identified two new infrared absorption bands in potassium vapor. The band between 1.1 and 1.6 {μ}m is attributed to the K₂ (³Σᵤ⁺→³Σg⁺) transition, the absorption analog of the intense emission continuum of H₂. The absorption at wavelengths longer than 1.6 {μ}m is probably due to trimers.
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Bhaskar et al. (1979) studied this question.
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