Measurement of plasma decay processes in mixture of sodium and argon by coherent microwave scattering

Zhili Zhang; Shneider, Mikhail N.
March 2010
Physics of Plasmas;Mar2010, Vol. 17 Issue 3, p033108
Academic Journal
This paper presents the experimental measurement and computational model of sodium plasma decay processes in mixture of sodium and argon by using radar resonance-enhanced multiphoton ionization (REMPI), coherent microwave Rayleigh scattering of REMPI. A single laser beam resonantly ionizes the sodium atoms by means of 2+1 REMPI process. The laser beam can only generate the ionization of the sodium atoms and have negligible ionization of argon. Coherent microwave scattering in situ measures the total electron number in the laser-induced plasma. Since the sodium ions decay by recombination with electrons, microwave scattering directly measures the plasma decay processes of the sodium ions. A theoretical plasma dynamic model, including REMPI of the sodium and electron avalanche ionization (EAI) of sodium and argon in the gas mixture, has been developed. It confirms that the EAI of argon is several orders of magnitude lower than the REMPI of sodium. The theoretical prediction made for the plasma decay process of sodium plasma in the mixture matches the experimental measurement.


Related Articles

  • Experimental Study of an MHD Source of Light with a TC Layer. Katsnelson, S. S.; Orishich, A. M.; Pozdnyakov, G. A. // Journal of Applied Mechanics & Technical Physics;Sep/Oct2003, Vol. 44 Issue 5, p620 

    The possibility of using a high‐temperature current layer initiated in a plasma flow as a powerful source of light with a wide range of emission is demonstrated. The study was performed on a setup with a disk MHD channel in the regime of TC layer generation in argon and sodium plasma flows.

  • Nonequilibrium effects of diluent addition in a recombining argon plasma. Gordon, M. H.; Kruger, C. H. // Physics of Fluids B: Plasma Physics;Mar93, Vol. 5 Issue 3, p1014 

    Spectroscopic and calorimetric measurements have been made using a 50 kW radio frequency inductively coupled plasma torch operated at atmospheric pressure with maximum temperatures and electron densities near 8500 K and 3×1021 m-3, respectively. The plasma flowed through a water-cooled...

  • Argon gas puff implosion experiments and two-dimensional modeling. Deeney, C.; LePell, P. D.; Cochran, F. L.; Coulter, M. C.; Whitney, K. G.; Davis, J. // Physics of Fluids B: Plasma Physics;Mar93, Vol. 5 Issue 3, p992 

    The K-shell x ray yields from argon gas puff Z pinches are observed to increase from 3.5±1.0 kJ to 13±1.0 kJ when inwardly tilted nozzles are used on a 6 TW, 4 MA generator. This increase is associated with the elimination of the zipper effect and the achievement of higher density plasmas,...

  • Emission Efficiency and Amplification Properties of the Plasma of a Pulsed Discharge in Ar at Elevated Pressures. Dem’yanov, A. V.; Lo, D. // Plasma Physics Reports;May2001, Vol. 27 Issue 5, p440 

    The spontaneous emission efficiency of an Ar[sup *][sub 2] excimer and its amplification properties at a wavelength of 126 nm are studied using a numerical model of the weakly ionized plasma of a pulsed discharge in Ar at elevated pressures. It is shown that, under real experimental conditions,...

  • Bias formation in a pulsed radiofrequency argon discharge. Smith, H.B.; Charles, C. // Journal of Applied Physics;7/15/1997, Vol. 82 Issue 2, p561 

    Investigates the effects of pulsing on a low pressure, capacitively coupled, rf argon plasma with the use of a one dimensional (1D) particle-in-cell (PIC) computer simulation. Details of the computer simulation process; Theory presented; Electrode voltage; Ion and electron currents; Plasma...

  • Multidipole confinement of argon and potassium plasmas. Bosch, Robert A.; Merlino, Robert L. // Review of Scientific Instruments;Dec1986, Vol. 57 Issue 12, p2940 

    Multidipole confinement of an argon discharge plasma and a potassium plasma produced by surface ionization was investigated. In both cases, a large volume of uniform density quiescent plasma was produced in the central region of low magnetic field strength. Measurements of electron and ion...

  • Electron temperature control with grid bias in inductively coupled argon plasma. Hong, J. I.; Seo, S. H. // Physics of Plasmas;Mar1999, Vol. 6 Issue 3, p1017 

    Studies electron temperature control with grid bias in inductively coupled argon plasma. Measurement of the electron energy distribution functions; Decrease of grid voltage.

  • Nonstationary laser-sustained plasma. Szymanski, Z.; Filipkowski, S. // Journal of Applied Physics;3/15/1991, Vol. 69 Issue 6, p3480 

    Focuses on a study which investigated the decay and recovery of laser-sustained argon plasma. Determination of temperature distributions at various phases of the discharge; Details of the experimental set-up; Description of the plasma evolution; Comparison between the experimental and...

  • Modeling argon inductively coupled plasmas: The electron energy distribution function and metastable kinetics. Kiehlbauch, Mark W.; Graves, David B. // Journal of Applied Physics;3/15/2002, Vol. 91 Issue 6, p3539 

    This article reports a simulation of argon inductively coupled plasma. Experimental measurements of the electron energy distribution function (EEDF) are fit to a power-law model and used to calculate electron impact rate coefficients in the simulation. Simulation results are compared to...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics