Measurements of Local Electric Fields in Low Density Plasmas via Stark-Splitting of Hydrogen Resonance Lines

  1. A. Steiger 2
  2. K. Grützmacher 2
  3. C. Pérez 1
  4. M. I. de la Rosa 1
  5. J. Seidel 2
  1. 1 Universidad de Valladolid
    info

    Universidad de Valladolid

    Valladolid, España

    ROR https://ror.org/01fvbaw18

  2. 2 Physikalisch‐Technische Bundesanstalt, 10587 Berlin, Germany
Actas:
AIP Conference Proceedings

ISSN: 0094-243X

Año de publicación: 2002

Tipo: Aportación congreso

DOI: 10.1063/1.1525440 GOOGLE SCHOLAR lock_openAcceso abierto editor

Objetivos de desarrollo sostenible

Resumen

The aim of this paper is to discuss in detail the schemes for electric field measurements in low density plasmas via Stark‐splitting of the first two hydrogen resonance lines. Beyond it, we have proved by experiment that advanced UV‐laser spectrometers, especially developed for two‐photon spectroscopy of plasmas, are well suited for this purpose. As a first demonstration at low electric fields, simple opto‐galvanic detection was chosen for measuring the Stark‐splitting of the Doppler‐free 1S‐2S and 1S‐3S/D two‐photon transition of atomic hydrogen produced by thermal dissociation in a small reference cell. In addition, we have performed measurements in a hollow cathode discharge which provides higher electric fields in its cathode fall region and the 1S‐2S spectrum was detected spatially resolved by means of an opto‐galvanic signal and polarization spectroscopy as well. Finally, another detection scheme, namely two‐photon induced Balmer‐α fluorescence applied as sheet diagnostic will be described.