Slipping surface discharge as a source of hard UV radiation

The UV-spectrum of a high-current slipping surface discharge radiation has been investigated experimentally by means of a liquid chemical actinometry technique. The photon fluxes emitted in the hard UV (icons/Journals/Common/lambda" ALT="lambda" ALIGN="TOP"/> <190 nm) and soft UV (190 nm<icons/Journals/Common/lambda" ALT="lambda" ALIGN="TOP"/> <430 nm) regions were determined by the H₂ O₂ yield in irradiated distilled water and by the Fe II yield in an irradiated solution of K₃ Fe(C₂ O₄ )₃ , respectively. The results obtained lead to the conclusion that the spectrum differs from the Planckian one by the presence of an `enriched' short-wavelength (icons/Journals/Common/lambda" ALT="lambda" ALIGN="TOP"/> <190 nm) component.