Electron-impact excitation collision strength Ω(nl-n'l')(3≤n≤7,4≤n'≤7) among configuration-average levels for the Ni-like Ions Pb⁵⁴⁺, Au⁵¹⁺,Ba²⁸⁺,Mo¹⁴⁺,Ge⁴⁺ have been calcuated systematically using the quasirelativitic distorted-wave methods. In addition, the collision strength in high limit have been calculated. The data for the collision strength or thermally averaged rate coefficient over the whole range of energy or temperature have been evaluated by a least-squares spline fitting procedure. As a result, the collision strength with arbitrary electron energy and rate coefficient with arbitrary temperature can be determined by ten parameters.

The problem of the slow convergence has been resolved in partial wave expansion for the excitations of electron-ion collisions, with three approximations including plane wave, coulomb Bethe and equimultiple decrease series. As an example, we have computed some important transitions of Ne-like Ge ion and made comparisons between the results obtained by three approximations. The results slow-that all the three methods are acceptable.

This paper briefly describes the theoretical deduction of the cross section of electron-ion impact excitation in Coulomb-Born approximation. The LS coupling representation of electron-ion system is used, the exchange effect is taken into account and the angular factors of collision matrix elements are treated in detail. The corresponding code-CBX(9) is programed. The situations of complex ions and incident electrons with lower energy can be computed by the code, which has wide applicability. The computational results are in well agreement with ones obtained from the other methods.

In astrophysics, plasma, quantum chemistry and advanced technique, an increasing demand for collision data is evident. Among those data,cross section of electron impact excitation is important and fundamental data. In this paper, we present the electron impact excitation cross section for some ions at high-energy incident electron. In our calculation, the LS coupling antisymmetric single configuration wavefuction of the target has been used. The plane wave BORN approximation has been used in treating the collision problem. Angular part of the transition matrix element of complex atom is treated carefully. We have computed single electron radial wavefunction of atom by means of HARTREE-FOCK-SLATER self consis-tent field method. We call our computer program as PBA(9). By thiscomputer progrom, we can compute excitation cross sections, collision strengths, generalized oscillator strengths and optical dipole oscillator strengths. In fact, we have computed widely from H-like to Ne-like iso-electronic sequences. It is made to compare our results with the other ones available. It shows that our results are satisfying for high energy electron. For example, the values of the excitation cross section for C and O fall into the accurate region of recommend data given by Japan's center NAGOYA of atamic data. We conclude that the method used in this paper is reliable and the results are correct. It can provide us with electron-impact excitation useful informantion of light atoms (ions)by high energy electron.