Self-absorbing method to measure the population of the metastable levels in an argon microwave plasma at atmospheric pressure

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Abstract
Metastable atoms play an important role in the kinetics of plasmas. A self-absorbing method has been used to determine the population density of Ar(3 P 0) and Ar(3 P 2) atomic metastable levels and Ar(1 P 1) and Ar(3 P 1) atomic resonant levels in an argon microwave discharge sustained by a surface wave at atmospheric pressure. Under the operative conditions investigated, the concentrations of these levels ranged from 1010−1012 cm−3, being in agreement with those reported in the literature, which seems to indicate that this method could be used for this calculation.

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