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The plasma levitation of droplets
7.The full width at half maximum (FWHM) of a Voigt line profile, ΔλV is related to its Gaussian and Lorentzian (FWHM) components, ΔλG and ΔλL, by the relation in which ΔλL = ΔλS + ΔλP and [M. Ivkovic, S. Jovicevic, and N. Konjevic, Spectrochim. Acta B 59, 591 (2004)].
11. O. I. del Rio and A. W. Neumann, “ Axisymmetric drop shape analysis: computational methods for the measurement of interfacial properties from the shape and dimensions of pendant and sessile drops,” J. Colloid Interface Sci. 196(2), 136–147 (1997).
13. Y. Raizer, Gas Discharge Physics ( Springer Verlag, 1987).
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We show how to levitate a liquid droplet above a plasma. Submitting a conductive
droplet to a voltage larger than 50 V, we get a levitation regime that looks like the one obtained with the well-known thermal Leidenfrost effect, except that light is emitted from beneath the droplet. Spectroscopic analysis shows that this light is emitted by a cold and dense plasma and also that lines coming from the cathode plate material are present revealing a local cathodic sputtering effect. We examine the conditions for the levitation to occur and show that the levitation is essentially of thermal origin. Assuming a stationary heat transfer, we present a model that accounts well for the observed levitation conditions. In particular, stable levitation is shown to be possible for thin cathode plates only.
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