Generation of micrometer-scale discharge in a supercritical fluid environment

Ito, Tsuyohito; Terashima, Kazuo
April 2002
Applied Physics Letters;4/22/2002, Vol. 80 Issue 16, p2854
Academic Journal
The generation of micrometer-scale discharge in very high-pressure CO[sub 2] up to a supercritical fluid (SCF) environment using micrometer-gap (1, 2 μm) electrodes has been performed. A peculiar characteristic of breakdown voltage for CO[sub 2] is reported here. The results reveal an inflection near 2.5 MPa and a trough near the critical point. Near the critical point, the discharge can be generated with almost one fifth of the voltage required for a conventional gas, as estimated from Paschen’s law, which is probably caused by unstable clusters in SCF. This result reveals that an ionized state or plasma state in a SCF environment can be generated with very low voltage. © 2002 American Institute of Physics.


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