Electron Impact Excitation of Positive Ions: Application to Ca+ 4s-4p and 3d-4p

摘要: A review is given of different approximate methods for computing cross sections transitions in positive ions produced by electron impact. It shown that it necessary to take into account the distortion ion field, and, strong optically allowed transitions. an allowance coupling effects must be made Application 4s--4p and 4p--3d singly ionized calcium shows neglect overestimates sections. However, results computed with a Coulomb distorted wave approximation were much larger than those Jefferies, who considered only one value (l = I) angular momentum incident electron, whereas main contribution occur I 4. The Bethe implies fact two approximations: weak "long range approximation." possible make corrections effects; such as Ca+, this methcd gives gocd very simple way.