Triplet satellite bands of KRb molecule in the far blue wings of K and Rb resonance lines

In a hot metal vapor of K-Rb mixture spectral phenomena of both K2 and Rb2 dimers usually appear together with KRb bands. Sometimes spectral overlaps preclude a clear observation of the satellite bands in the vicinity of the first resonance lines. However, in the case of potassium-rubidium vapor mixture the resonance lines are located within 765–795 nm spectral region, and the very far blue quasistatic wing can be investigated in detail. The interpretation of the KRb satellite bands in this region is given regarding recent ab initio calculations of the relevant potential curves.