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We studied excitation wavelength and temperature during irradiation of atmospheric-pressure nonequilibrium argon plasma to pure metal plate. We observed excitation emission of light activated by argon plasma in the same wavelength region, both with and without metal plate. The wavelength region activated by atmospheric-pressure nonequilibrium argon plasma was limited. In the presence of the ion corresponding to wavelength region activated by argon plasma, corresponding ions were activated. Both oxygen ions and metal ions are generated by plasma irradiation, but during each observed wavelength, the wavelength of metal ion activated by argon plasma was dominant, because excitation energy of oxygen ion is greater than that of each metal ion. Heat propagation from argon plasma to metal plate occurs by plasma irradiation. Consequently, heat propagation from argon plasma to copper plate is greater in comparison to cases with other metal plates. This is due to the high thermal conductivity of copper. In the case of atmospheric-pressure nonequilibrium plasma, plasma is affected by interaction with an object, because plasma energy is smaller, and temperature of nonequilibrium plasma changes via with thermal conductivity of the object.

Excitation Wavelength and Temperature at Irradiation of Metal by Atmospheric-Pressure Nonequilibrium Argon Plasma