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The paper reports on measurements of oxygen atoms and metastable singlet O2(1Δ) molecules in the flowing afterglow of a negative glow type plasma. Two methods of vacuum ultraviolet absorption spectroscopy are used. Compared to available data in positive column, results exhibit about same atomic concentration but a much smaller metastable concentration. Corresponding creation and loss mechanisms are proposed.
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Sahli et al. (1992) studied this question.
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