Kr photoionized plasma induced by intense extreme ultraviolet pulses
- Institute of Optoelectronics, Military University of Technology, Kaliskiego 2, 00–908 Warsaw (Poland)
Irradiation of any gas with an intense EUV (extreme ultraviolet) radiation beam can result in creation of photoionized plasmas. The parameters of such plasmas can be significantly different when compared with those of the laser produced plasmas (LPP) or discharge plasmas. In this work, the photoionized plasmas were created in a krypton gas irradiated using an LPP EUV source operating at a 10 Hz repetition rate. The Kr gas was injected into the vacuum chamber synchronously with the EUV radiation pulses. The EUV beam was focused onto a Kr gas stream using an axisymmetrical ellipsoidal collector. The resulting low temperature Kr plasmas emitted electromagnetic radiation in the wide spectral range. The emission spectra were measured either in the EUV or an optical range. The EUV spectrum was dominated by emission lines originating from Kr III and Kr IV ions, and the UV/VIS spectra were composed from Kr II and Kr I lines. The spectral lines recorded in EUV, UV, and VIS ranges were used for the construction of Boltzmann plots to be used for the estimation of the electron temperature. It was shown that for the lowest Kr III and Kr IV levels, the local thermodynamic equilibrium (LTE) conditions were not fulfilled. The electron temperature was thus estimated based on Kr II and Kr I species where the partial LTE conditions could be expected.
- OSTI ID:
- 22599169
- Journal Information:
- Physics of Plasmas, Vol. 23, Issue 4; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BEAMS
BOLTZMANN EQUATION
COMPARATIVE EVALUATIONS
ELECTRON TEMPERATURE
ELECTRONS
EMISSION
EMISSION SPECTRA
EXTREME ULTRAVIOLET RADIATION
IONS
IRRADIATION
KRYPTON
LASER-PRODUCED PLASMA
LTE
PHOTOIONIZATION
PULSES
STREAMS
TEMPERATURE RANGE 0065-0273 K
ULTRAVIOLET SPECTRA
VISIBLE SPECTRA