[en] The emission spectrum of laser produced magnesium plasma has been recorded photographically in 4-12 nm spectral range by means of a grazing incidence grating spectrograph. Using isoelectronic regularities from known spectra of other neighbouring ions, the spectral lines of Be-like magnesium ions have been recognized and many new ones are obtained

[en] Results of the recombination pumped soft X-ray laser gain experiment of Li-like silicon ions are described. The spectra from line-focused laser plasmas on slab silicon targets in 5∼12 nm region are taken by an 1 m unastigmatic grazing incidence grating spectrograph. The gain coefficients of Si¹¹⁺5f-3d(8.89 nm) and 5d-3p(8.73 nm), deduced from the ratio of on-axis to off-axis time-integrated intensity are 1.4 cm^-1 and 0.9 cm^-1, respectively; The corresponding gain coefficients deduced from the growth curve of on-axis intensity with the length of the line-focused laser plasma are 1.5 cm^-1 and 1.4 cm^-1, respectively

[en] Short communications only

[en] The emission spectrum of laser-produced cobalt plasma has been recorded photographically in the 8-15 A spectral range by means of a flat TlAP crystal spectrograph, based on isoelectronic regularities from known spectra of other ions, most of cobalt spectral lines are classified as belonging to the Na, Ne, F, O, N, C, B, Be, and Li I isoelectronic sequences. (orig.)

[en] In this paper, it presents Multi-continua and satellites lines structures of plasma emission obtained with stigmatic spectrograph and crystal spectrograph. Determination and analysis of the plasma parameters are made. The experimental results gave effects of impurity and plasmas parameters on multi-continua overlap and satellites lines abundance

[en] Spectral diagnostic technique was used to study the properties of line-shaped laser plasmas. Electron temperature and electron density profiles were deduced from the spectra obtained by a pinhole crystal spectrograph. The Stark-broadened line-wings of hydrogenic ions were used to deduce the electron density beyond the critical surface, and the results were compared with the theoretical model of planar laser-driven ablation. Time integrated properties of line-shaped laser plasma were also discussed and compared with those of spot-shaped laser plasma and the laser absorption theoretical estimations

[en] A program was developed using the Marquardt algorithm method to fit the Stark-broadened line wings of hydrogenic ions, which can be conveniently used to measure electron density in laser-produced plasma. Applications of the method are illustrated using space-resolved 2p-1s resonance lines in line-shaped laser plasmas of Mg slab targets irradiated with different laser intensity. Space-resolved electron densities higher than the critical density are obtained by fitting the Stark-broadened line wings with the program

[en] The principle, parameters and experimental results of the toroidal mirrorgrazing incidence grating spectrograph system used for obtaining spatially resolved XUV spectra of laser plasma are described, and the merits and demerits of this toroidal mirror technique and the crossed-slit technique are discussed

[en] Through analysing the spatial distribution characteristics of the linewidth of Li-like silicon ions X-ray lasers, it is shown that Stark broadening is the main line broadening mechanism for Li-like Si¹¹⁺ ions recombine X-ray laser. Spatial distribution of the electron density of gain medium obtained by Stark broadening shows that the electron density in the gain region is about 10¹⁹/cm³, and the lasing linewidth and electron density are 0.21 A and 2.9 x 10¹⁹/cm³ at the gain maximum respectively

[en] We presented herein an observation on the difference of spatial behavior between 4d-3p and 4f-3d transitions of lithium-like ions in laser-produced plasma, by a flat-field grating spectrograph with a spatial resolution of about 35 μm. The Z-dependent and space-dependent characteristics of intensities ratio of 4d-3p and 4f-3d transitions of Li-like ions was found and a new method for the electron density measurement was proposed