• Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/032/05/0627-0639

    • Keywords

       

      Plasma focus; electron density; Stark broadening; Doppler effect; quadratic Stark effect

    • Abstract

       

      Optical emission spectroscopic studies were carried out to characterise the plasma leading to the estimation of two plasma parameters, electron density and temperature. These experiments were conducted on a 2 kJ plasma device which is equipped with squirrel cage electrode configuration enclosed in a glass vacuum chamber filled with hydrogen at a pressure of 5 mbar. Spectral emissions obtained from each flash were photographed in the region of 4000–6000 Å using one metre Czerny-Turner spectrograph cum monochromator. Detailed examination of the observed features showed that theHβ andHλ lines of hydrogen showed significant broadening of the order of 35 Å FWHM which is due to Stark effect expected in high density plasmas. Further several atomic lines of Cu and Zn from the electrode material (brass) showed broadening which was due to quadratic Stark effect. A comparative study of the broadening of lines obtained in DC arc, hollow cathode and plasma focus was made. Electron density from Stark broadened hydrogen lines and quadratic Stark Coefficient C4 for the CuI and ZnI lines were evaluated. The excitation temperature was determined from the line intensity ratio method using CuI lines.

    • Author Affiliations

       

      P Meenakshi Raja Rao1 P Saraswathy1 G Krishnamurty1 R K Rout2 S K H Auluck2 Anurag Shyam2 I V Kulkarni2 Dipak H Oza3

      1. Spectroscopy Division, Bhabha Atomic Research Centre, Bombay - 400 085, India
      2. Neutron Physics Division, Bhabha Atomic Research Centre, Bombay - 400 085, India
      3. Centre for Radiation Research, National Bureau of Standards, Gaithersburg, Maryland - 20899, USA
    • Dates

       
  • Pramana – Journal of Physics | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2017-2019 Indian Academy of Sciences, Bengaluru.