Excimer radiation from Na—Noble-gas and K—Noble-gas molecules

Emission bands from Na-noble-gas (and K-noble-gas) molecules, due to transitions between the 4sσ (and 5sσ) bound excited states and dissociating ground states, are observed. The noble gases used are Ar, Kr and Xe. The red shift of the emission band from the forbidden atomic s-s transition is largest for NaXe, for which it is 3055 cm^?1. This NaXe band may be useful as an excimer laser source, tunable from 4280 Å to 4500 Å.