No Access Submitted: 09 September 2002 Accepted: 21 January 2003 Published Online: 21 March 2003
Journal of Applied Physics 93, 4334 (2003); https://doi.org/10.1063/1.1560564
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  • S. P. Jamison
  • Jingling Shen
  • D. R. Jones
  • R. C. Issac
  • B. Ersfeld
  • D. Clark
  • D. A. Jaroszynski
Terahertz time–domain spectral techniques are applied to the characterization of a He discharge plasma. Electro-optically sampling of the electric field of a quasi-unipolar terahertz pulse transmitted through the plasma has allowed both the real and imaginary parts of the plasma permittivity to be simultaneously measured over a large spectral range. The plasma density and the collisional frequency are determined within a 30 ps duration measurement window. An anomalously high collisional frequency has been measured.
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