Abstract
Iodine when excited in the presence of argon shows three band systems in the regions 4420–4000 A., 3,460–3015 A. and 2785–2731 A. all of which involve O Emphasis>+ (3π u ) state at 15642 cm.−1 as the common lower state. It is pointed out in this article that the transitions involving the first two band systems are suitable for laser action as these transitions are very strong and as their common lower state gets efficiently flushed out due to the crossing or touching of a O Emphasis>− repulsive state while a continued high frequency discharge through a mixture of iodine and argon would keep the upper state populated all the time. Tuning of the interferometer system is expected to make this laser action possible in a wide range of frequencies.
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