Figure 4.

UV spectra with electron emission characteristics of C-beam pumping. (a) UV spectra of different V_a. As the V_a increases, the intensity of the peak in the far UVC region increases. (b) As V_a increases, the peak irradiance at 226 nm increases. V_a affects the peak irradiance of the UVC region. (c) UV spectra of different I_a. At V_a of 10 kV, the main peak wavelength decreases and the peak irradiance tends to increase. (d) Peak irradiance increases, and the peak wavelength decreases with I_a increases up to 1.3 mA.