Balmer H _α, H _β and H _γ Spectral Lines Intensities in High-Power RF Hydrogen Plasmas

H _α (Balmer-alpha), H _β (Balmer-beta) and H _γ (Balmer-gamma) spectral line inten- sities in atomic hydrogen plasma are investigated by using a high-power RF source. The intensities of the H _α, H _β and H _γ spectral lines are detected by increasing the input power (0-6 kW) of ICPs (inductively coupled plasmas). With the increase of net input power, the intensity of H _α im- proves rapidly (0-2 kW), and then reaches its dynamic equilibrium; the intensities of H _β can be divided into three processes: obvious increase (0-2 kW), rapid increase (2-4 kW), almost constant (4-6 kW); while the intensities of H γ increase very slowly. The energy levels of the excited hydro- gen atoms and the splitting energy levels produced by an obvious Stark effect play an important role in the results.