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 theH β andH λ 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.
Similar content being viewed by others
References
Allen C W 1932Phys. Rev. 39 42
ASTM 1971 Methods for emission spectrochemical analysis p. 250 (Sponsored by ASTM Committee E. 2 on Emission spectroscopy)
Baranger M 1958Phys. Rev. 111 481
Boumans P W J M 1966Theory of spectrochemical excitation (Hilger and Watts Ltd. London)
Brode W 1952Chemical spectroscopy (New York: John Wiley and Sons Inc.)
Cooper J 1966Rep. Prog. Phys. 29 35
De Michelis C and Mattioli M 1984Rep. Prog. Phys. 47 1233
Griem H R 1974 Spectral line broadening by plasmas (New York: Academic Press)
Griem H R 1964Plasma spectroscopy (New York: McGraw-Hill Inc.)
Kastner S O 1980J. Opt. Soc. Am. 70 1371
Kolb A C and Griem H R 1958Phys. Rev. 111 514
Konjevic N and Roberts J R 1976J. Phys. Chem. Ref. Data 5 209
Mather J W 1971Methods of experimental physics (New York: Academic Press)B9 p. 187
Murty M V R K, Shukla R P, Bhattacharya S and Krihnamurty G 1987BARC Report 1362
Rout R K, Auluck S K H, Anurag Shyam, Kulkarni I V, Meenakshi Raja Rao P, Saraswathy P and Krishnamurty G 1987 (June 29–30) Paper presented at the fifth International workshop on plasma focus andZ-pinch research Toledo Spain
Scheeline A, Kamla G J and Zoellner M J 1984Spectrochim. Acta B39 677
Shyam A 1981Studies on a low energy plasma focus fusion device Ph.D. Thesis Univ. of Bombay
Sobel’man I I 1972Introduction to the theory of atomic spectra (Oxford New York: Pergamon Press)
Sobel’man I I 1979Atomic spectra and radiative transitions (Berlin: Springer-Verlag)
Vidal C R, Cooper J and Smith E W 1973Astrophys. J. Suppl. Ser. 25 37
Weisheit J C 1981Atomic phenomena in dense plasmas Princeton University, New Jersey PPPL 1765
Wiese W L and Kelleher D E 1971Ap. J. Letts 166 L59
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Raja Rao, P.M., Saraswathy, P., Krishnamurty, G. et al. Line broadening studies in low energy plasma focus. Pramana - J. Phys. 32, 627–639 (1989). https://doi.org/10.1007/BF02847387
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF02847387