Measurement of the electron density in a microwave plasma torch at atmospheric pressure

Zhang, Qing; Zhang, Guixin; Wang, Liming; Wang, Xinxin; Wang, Shumin; Chen, Yan
November 2009
Applied Physics Letters;11/16/2009, Vol. 95 Issue 20, p201502
Academic Journal
The electron density in a microwave plasma torch at atmospheric pressure was measured with a Mach–Zehnder interferometer. The electron density is on the order of 1017/cm3, one order higher than that deduced from the Stark broadening of spectral lines, and increases with the increase in the microwave power. The spatial distribution of the electron density was obtained. The highest electron density locates at the symmetrical axis of the plasma torch and decreases radially. It was found that the electron density fluctuates within a range of 0.3 with the time under the same experimental conditions.


Related Articles

  • OH number densities and plasma jet behavior in atmospheric microwave plasma jets operating with different plasma gases (Ar, Ar/N, and Ar/O). Wang, C.; Srivastava, N. // European Physical Journal D -- Atoms, Molecules, Clusters & Opti;Dec2010, Vol. 60 Issue 3, p465 

    OH radical number density in multiple atmospheric pressure microwave plasma jets is measured using UV cavity ringdown spectroscopy of the OH (A-X) (0-0) band at 308 nm. The plasma cavity was excited by a 2.45 GHz microwave plasma source and plasma jets of 2-12 mm long were generated by using...

  • Multi-chord fiber-coupled interferometer with a long coherence length laser. Merritt, Elizabeth C.; Lynn, Alan G.; Gilmore, Mark A.; Hsu, Scott C. // Review of Scientific Instruments;Mar2012, Vol. 83 Issue 3, p033506 

    This paper describes a 561 nm laser heterodyne interferometer that provides time-resolved measurements of line-integrated plasma electron density within the range of 1015-1018 cm-2. Such plasmas are produced by railguns on the plasma liner experiment, which aims to produce μs-, cm-, and...

  • Turbulent microwave plasma thermodynamics for fundamental fluctuation modes. Podder, N. K.; Johnson, J. A.; Mezonlin, E. D. // Physics of Plasmas;Aug2002, Vol. 9 Issue 8, p3364 

    Microwave plasmas are generated in helium, neon, argon, krypton, and xenon at a range of microwave powers from 300 to 1800 W. A floating Langmuir double probe is employed to determine plasma electron density and temperature for all five species. The standard turbulence analysis is carried out by...

  • The Electromagnetic Field in the Plasma Jet of a Microwave Plasmatron. Kirichenko, A. Ya.; Motornenko, A. P.; Rusanov, A. F.; Suvorova, O. A.; Yakovenko, V. M. // Technical Physics;Apr2001, Vol. 46 Issue 4, p386 

    A coaxial microwave plasmatron operating at a frequency of 10 GHz is investigated. The microwave field distribution in the plasma jet of the plasmatron is studied using a vibrating string as a small perturbation source. The phase structure of the microwave field inside the plasma is found to...

  • Microwave Plasma Torch for Analytical Spectrometry. Vlasov, D. V.; Sergeıchev, K. F.; Sychev, I. A. // Plasma Physics Reports;May2002, Vol. 28 Issue 5, p444 

    A microwave argon plasma torch is used to excite the spectra of various materials admixed to the working gas. It is shown that this torch is a very efficient tool for detecting extremely low impurity concentrations in the sample material. An important advantage of the method is the simplicity of...

  • Plasma jet formation in x-pinch plasmas. Aliaga-Rossel, R.; Mitchell, I. H.; Saavedra, R.; Chuaqui, H.; Favre, M.; Wyndham, E. S. // AIP Conference Proceedings;2001, Vol. 563 Issue 1, p270 

    Plasma formation in a x-pinch -formed from two 10 µm A1 wires at a current of 100 kA- was studied by using a two frame Mach Zender interferometer. It was observed that the plasma column that forms on the axis of the x-pinch, does not come entirely from the coronal plasma from the limbs but...

  • Measurement of Reactive Hydroxyl Radical Species Inside the Biosolutions During Non-thermal Atmospheric Pressure Plasma Jet Bombardment onto the Solution. Kim, Yong; Hong, Young; Baik, Ku; Kwon, Gi; Choi, Jin; Cho, Guang; Uhm, Han; Kim, Do; Choi, Eun // Plasma Chemistry & Plasma Processing;May2014, Vol. 34 Issue 3, p457 

    Non-thermal atmospheric pressure plasma jet could generate various kinds of radicals on biosolution surfaces as well as inside the biosolutions. The electron temperature and ion density for this non-thermal plasma jet have been measured to be about 0.8~1.0 eV and 1 × 10 cm in this...

  • Assessment of density profile automatic evaluation from broadband reflectometry data. Varela, P.; Manso, M.; Vergamota, S.; Grossmann, V.; Santos, J. // Review of Scientific Instruments;Jan2001, Vol. 72 Issue 1, p315 

    Automatic evaluation of electron density profiles from frequency modulated continuous wave (FM–CW) broadband microwave reflectometry on ASDEX Upgrade has been achieved in all plasma regimes combining a high performance system and advanced analysis tools. The results presented demonstrate...

  • Production of H- Ions by Surface Mechanisms in Cs-free Multi-dipolar Microwave Plasma. Béchu, Stéphane; Lemoine, Didier; Bacal, Marthe; Bès, Alexandre; Pelletier, Jacques // AIP Conference Proceedings;3/12/2009, Vol. 1097 Issue 1, p74 

    This study demonstrates the feasibility of the recently proposed idea of enhancing recombinations of the hydrogen atoms from the plasma on a surface in order to produce highly vibrationally excited molecules that can be attached and dissociated by the cold electrons of the plasma, hence creating...


Read the Article


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

Try another library?
Sign out of this library

Other Topics