Kiel 2004 – scientific programme

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K: Kurzzeitphysik

K 1: Strahlungsquellen UV - VUV - EUV

K 1.4: Talk

Tuesday, March 9, 2004, 11:50–12:10, A

Vacuum ultraviolet emission from microhollow cathode discharges by applying nanosecond voltage pulses — •Byung- Joon Lee¹, Leopold D. Biborosch², Isfried Petzenhauser¹, and Klaus Frank¹ — ¹Physics Department 1, University of Erlangen-Nuremberg — ²Al.I.Cuza University of Iasi, Romania

Microhollow cathode discharges (MHCD) are high-pressure, non-equilibrium gas discharges that can be operated up to atmospheric pressure. A typical MHCD setup consists of two 100 µm thick electrodes which are separated by an insulator of similar thickness. A bore hole was drilled through the MHCD by laser or mechanical drill with a diameter in the range of 100 µm. Recently, MHCDs are intensively investigated as VUV emission sources in rare gases and rare gas-halides. In our experiments argon and xenon are used as working gases. It has been shown that the efficiency of the VUV emission in pulsed mode decreases with the pulse duration. Therefore we use nanosecond voltage pulses and superimposition of nanosecond voltage pulses on a d.c. MHCD. The d.c. is used to preionize the gas in the MHCD. The efficiencies of both setups will be compared and discussed.