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• W798461908 abstract "MD Bowden, E Wagenaars, and GMW Kroesen Department of Physics and Astronomy, The Open University, Milton Keynes MK7 6AA UK Department of Applied Physics, Eindhoven Un. of Technology, PO Box 513, Eindhoven, The Netherlands Measurement techniques for electric field measurements have advanced greatly in recent years, and have been applied in a variety of plasmas. This paper will give a brief overview of recent work in this area, concentrating on measurements of field during the ignition phase of a low pressure plasma. The spectroscopy of atoms and molecules has been used to infer local electric fields in plasmas for many years. The development of laser-based methods in the 1980s enabled spatially and temporally resolved measurements to be made [1-4]. Further advances in recent years have increased the number of species whose Stark spectroscopy can be used as the basis of these measurements [5-7]. Fig 1 shows an example of a spectroscopic scheme based on the spectroscopy of atomic xenon. Two lasers are used to excite the ground state atoms to highly excited Rydberg states. The excitation frequencies depend on the local electric field, and hence measurement of the excitation spectrum enables the local electric field to be determined. Schemes such as this have been used in a variety of applications. In this paper, we describe recent measurements during plasma ignition. This study examined breakdown between two metallic electrodes at medium pressure. The electrodes were parabolic in shape, made of polished stainless steel, and were separated by 3.3 mm. The breakdown was examined in argon gas at a pressure of 3.5 mbar. A pulsed dc voltage was used to generate a plasma between the electrodes. A two-dimensional imaging system, based on a high-resolution ICCD camera, was used to measure total plasma emission as a function of time. These measurements showed an ionization and emission front crossing the gap between the electrodes as the discharge ignited. The electric field measurement shows that there is a significant enhancement in the electric field at the time when the emission front crosses the measurement volume. The results were interpreted as indicating that the ionization front is accompanied by a narrow region of enhanced electric field. This can be understood by considering the build-up of space charge in the gap during the ignition process. More details of the measurement method and the results themselves are available elsewhere [8,9]. [1] CA Moore, GP Davis a RA Gottscho: Phys. Rev. Lett. Vol 52, p538 (1984) [2] BN Ganguly and A Garscadden: Phys. Rev. A Vol 32, p2544 (1985) [3] EA Den Hartog, DA Doughty and JE Lawler: Phys. Rev. A, p2471 (1988) [4] GA Hebner, KE Greenberg and ME Riley, J Appl. Phys. Vol 76 p4036 (1994) [5] VP Gavrilenko et al: Phys. Rev. E Vol 62 p7201 (2000) [6] E. Wagenaars, G.M.W. Kroesen, M.D. Bowden, Phys. Rev. A, 74(3), 033409, (2006). [7] T Kampschulte et al: New J. Phys. 9 (2007) 18. [8] E. Wagenaars, M.D. Bowden and G.M.W. Kroesen, Phys. Rev. Lett. 98, 075002 (2007) [9] E Wagenaars, MD Bowden and GMW Kroesen, Phys. Rev. A Vol 74 art. No. 033409 (2006) Fig. 1: Excitation scheme for 2+1 photon fluorescence dip spectroscopy in atomic xenon. nd Rydberg states" @default.
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• W798461908 date "2007-01-01" @default.
• W798461908 modified "2023-09-26" @default.
• W798461908 title "Electric field measurements by laser spectroscopy" @default.
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