ON THE CROSS-SECTIONS OF THE TRANSITIONS BETWEEN RYDBERG STATES OF HIGHLY-CHARGED IONS INDUCED BY ELECTRON-IMPACT

Two methods, the Method of Effective Trajectories and the Method of Di storted Particle Flux, are suggested for calculation of cross-sections of n-n' transitions between Rydberg states of multicharged ions induc ed by electron impact. These methods are based on rectilinear trajecto ries with affective impact parameter and effective velocity. The diffe rence between direct calculations of Coulomb-Born cross-sections and t hese methods for transitions with principal quantum numbers n,n' less than or equal to 6 is about 10-20%. Calculations of cross-sections 20 --> 20 + Delta n are given.