Schematic of the configuration of an a-C:H-coated micropipette electrode and plate electrode (ground) with an electrical circuit for corona discharge.
(a) Typical discharge current (left scale) of an a-C:H-coated micropipette electrode with time. Applied voltage (right scale) increased in steps of per 5.0 s. (b) Discharge current (left scale) of the same electrode for a subsequent discharge test.
Photograph of luminescence at the tip of a micropipette electrode in the glow corona mode.
Changes in discharge current for four micropipette electrodes. One division on the horizontal scale is equivalent to 100 V at 100 s. The circles at the end of the current curves indicate the terminated points of discharge, for which the voltages are (a) 1840 V, (b) 1850 V, (c) 1920 V, and (d) 2260 V.
Scanning electron micrographs of tips of micropipette electrodes after voltage application. Images (a), (b), (c), and (d) correspond to the discharge termination points shown in Fig. 4. Image (e) is an enlargement of image (c).
Relationship between gap distance and onset voltage for micropipette electrodes with a-C:H films deposited under three different conditions. Onset voltage is defined to be voltage applied when discharge current reaches .
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