ABSTRACT
Recently the 19.6 nm lasing line due to 3p - 3s, J= 0-1 transition in Ne-like Ge ion was found to be linear polarized parallel to the target plane with a degree of polarization of-53 % (Kawachi et al. 1995 Phys. Rev. Lett. 75 3826). In their theoretical model, Kawachi et al. demonstrated that a spatial anisotropy of the radiation trapping in the plasma explained partly this high polarization. The electron anisotropy produced during the heating of the plasma by the laser can also produce some linear polarization (Kieffer et al. 1992 Phys. Rev. Lett. 68 480). It is therefore possible that both anisotropical processes explain a so large polarization of the lasing line. In the present work, we have calculated the electron impact collision strengths of Ne-like Ge magnetic sublevels which have to be inserted in a theoretical model which consider anisotropical electron distributions.
