Atomic and molecular spectra emitted by normal liquid 4He excited by corona discharge


  • Z.-L. Li G2E.lab, CNRS et Universite Joseph Fourier, Grenoble, France
  • N. Bonifaci G2E.lab, CNRS et Universite Joseph Fourier, Grenoble, France
  • A. Denat G2E.lab, CNRS et Universite Joseph Fourier, Grenoble, France
  • V.M. Atrazhev Joint Institute for High Temperatures, RAS, Moscow, Russia
  • V.A. Shakhatov Topchiev Institute of Petrochemical Synthesis, RAS, Moscow, Russia
  • K. von Haeften Department of Physics and Astronomy, University of Leicester, UK


Ключові слова:

spectra, liquid normal helium, corona discharge.


The liquid 4He at fixed temperature 4.2 K and different pressures up to 8 MPa was excited by corona discharge of both negative and positive polarity. Emission of He I atomic lines and He2 molecular bands are observed. In negative corona the lines spectra show a distinct blue-shift and line-broadening, which becomes stronger with the pressure increasing. The rotational structure of molecular bands is resolved at pressures (0.1–0.2) MPa. The blue shift of the Q-branch maximum at different pressures was observed. Rotational temperature of 900 K has been estimated for the d3Σu+b3Πg molecular band. A positive corona was realized on a point anode for fewer radii of the electrode and larger voltage than in the negative corona. Electric currents in both negative and positive corona differ weakly. Spectral analysis of the radiation from the positive corona shows qualitative differences of spectral features of these discharges. The spectra observed in the positive corona have marked nonsymmetric shape. The asymmetric atomic and molecular spectra show an increased intensity of their long-length (red) wings.


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Як цитувати

Li, Z.-L.; Bonifaci, N.; Denat, A.; Atrazhev, V.; Shakhatov, V.; Haeften, K. von. Atomic and Molecular Spectra Emitted by Normal Liquid 4He Excited by Corona Discharge. Fiz. Nizk. Temp. 2011, 37, 484-490.