Study of nanosecond pulsed corona-like discharge in deionized water by optical methods

摘要

Basic morphologic structure and emission fingerprints of micro-discharges produced in deionized water by short high voltage pulses (duration of 6 ns and amplitude of + 100 kV) are presented. Time-resolved ICCD images evidence typical streamer-like branched filamentary structure of the discharge with propagation velocity 2-4×10⁵ m/s. Emission spectra show a broad-band continuum evolving during the first few nanoseconds followed by the well-known H^I/O^I atomic lines. The electron densities were estimated of the order of 10¹⁹ cm^-3.