Abstract
The vacuum UV fluorescences from rare-gas-alkali ionic excimer Kr+Li were observed by the relativistic electron beam excitation of a gas mixture of krypton with a hot vapor of lithium. The observed two diffuse emission bands centered at 147 and 149 nm were assigned to the 21Σ+→11Σ+ and 11Π→11Σ+ transitions of the Kr+Li ionic excimer. A maximum net gain coefficient about 0.05 cm-1 for the 147-nm band was obtained in the present experiment. Another two similar diffuse bands observed at 186 and 189 nm from Xe/Li gas mixtures were assigned to the same transitions of the Xe+Li ionic excimer molecule.
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