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Atmospheric pressure helium discharge characteristics were investigated for varying driving radio frequencies in the range between 1.86 and 27.1 MHz. As the driving frequency is raised, both gas breakdown and ␣-␥ transition voltages decrease due to the reduction in the electron drift loss. In addition, different discharge features such as normal, abnormal, ␣, and ␥ modes show certain dependences on the frequency. Using a simple circuit model, the changes in sheath thickness from 2.35 to 0.11doi:10.1063/1.3043451 fatcat:xfu7fgwl45evrhjiyjt5qoej74