Analysis of the intensities of line spectra of multiply charged ions in a laser plasma and their applications in calibration of spectroscopic instruments in far vacuum ultraviolet

An analysis was made of the distribution of the relative intensities of spectral lines with a common upper level in transitions of the $2s2p^{k+1}-2p^{k+2}$ type in $N-$, $C-$. $B-$ and $Be$-like ions of $Ca$, $Ti$, and $Fe$ excited in a laser plasma and recorded photographically by a glancing-incidence spectrograph. Use was made of theoretically calculated transition probabilities. The relative spectral sensitivity of a DFS-6 spectrograph used in combination with UF-4 photographic emulsions was determined as a function of the wavelength in the range 100-250 $\mathring{A}$. It was found that the dependence is nonmonotonic. The results were used in some diagnostic applications to laser plasma spectra.