The possibility of lasing of the O 2 + ion in a He-O 2 mixture excited by a high-speed discharge is studied experimentally. It is found that the gain measured at the first negative band of O 2 + has a positive value. The peak values of the gain coefficient at 563.2 nm and 559.7 nm are found to be about 0.015 cm -1 .
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M Kokawa (1982) studied this question.
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