Electron-impact broadening of the 3s-3p lines in low-Z Li-like ions

The collisional electron-impact line widths of the 3s-3p transitions in Li-like ions from B III to Ne VIII are calculated with the convergent close-coupling (CCC) method from the atomic collision theory. The elastic and inelastic contributions to the line broadening and their Z-scaling are discussed in detail, and comparisons with recent experimental and theoretical results are also presented. It is found that similar to our previous study of line broadening in Be-like ions, the difference between experimental and CCC results monotonically increases with the spectroscopic charge of an ion.Comment: 23 pages, 8 figures, 1 table. To be published in JQSR

Enhanced Balmer-[MATH] emission in interpenetrating plasmas

The interpenetration of laser produced plasmas can be detected by the occurrence of charge exchange reactions. Such reactions only occur if highly charged ions collide with ions of a significantly lower charge in suitable energy levels. This leads to selective population of a specific level of the highly charged ion resulting in an enhancement of particular lines in the region of the interaction. In case of interpenetrating carbon plasmas these reactions lead to enhanced line emission at 18.2 nm (H[MATH] line of C VI). We present spatially and temporally resolved investigations of the interaction region of colliding plasmas ; we show results of calculations of the cross sections for charge exchange obtained with a semi-classical model and compare measured spectra with calculated ones obtained from a collisional radiative model