Abstract
A time-integrated space-resolved emission spectroscopic technique was developed in the VUV spectral range for the measurement of the electron number density and excitation temperature of laser-produced steel plasmas. 400 mJ pulses of Nd:YAG laser (7 ns duration) emitted at the fundamental wavelength of 1.06 μm are used to create the steel plasmas under moderate vacuum conditions (∼ 0.2 mbar). The electron number density was estimated from measurements of the FWHM of the Stark-broadened C II 68.73nm carbon spectral line. The excitation temperature was evaluated by the Boltzmann’s plot method for five selected Fe III iron spectral lines in the wavelength range 89-93nm.
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