Abstract
It was shown that a buffer gas, owing to collisions, can significantly redistribute the IR radiation arising under two-photon excitation of the 6S level of K atom. This can result in the suppression of the 6S → 5P lines by the 4D → 5P lines. The dependences of IR radiation energy on both the K-vapor and the buffer gas density were investigated. A possible mechanism of this phenomenon is discussed.
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