Abstract
Summary: The 33S→23S system of Richardson and Das is extended, the band previously given as the null band (00) now being taken as (20), while two additional vibrational levels are added on the infra-red side. An analysis of the system based on the new mechanics is given, and various tests are applied to prove the correctness of the new arrangement. A Table giving the constants of the 23S and 33S states is appended.My thanks are due to Professor H. Stanley Allen of St Andrews for encouragement and helpful criticisms.

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