Features of experimental spectra of the laser plasma with a dense xenon gas-jet target in the extreme ultraviolet range

Emission spectra in the wavelength range of 5–25 nm of the laser plasma produced using a gas jet of Xe and a mixture of Xe + Ar with an atomic density of up to 7 $\times$ 10$^{18}$ cm$^{-3}$ are described. There are no discrete spectral lines in the xenon spectra, but a wide continuous peak of the radiation is observed within the 9–14 nm wavelength band. At variations of experimental conditions, its maximum demonstrates a regular wavelength shift, which is attributed to the corresponding change in the plasma temperature. Another feature is an only slight decrease in the intensity of xenon emission when the target is strongly diluted with argon.