Binary encounter dipole model

Y.-K. Kim, M.E. Rudd, Binary-encounter-dipole model for electron-impact ionization, Phys. Rev. A 50 (1994) 3954. 

W.M. Huo, Convergent series representation for the generalized oscillator strength of electron-impact ionization and an improved binary-encounter-dipole model, Phys. Rev. A 64 (2001) 042719. 

Kim and Rudd [39] have developed such a model, the binary encounter dipole (BED) model, in which the dilferential ionization cross sections are given by... 

The binary-encounter-dipole (BED) model of Kim and Rudd [31] couples the modified form of Mott cross section [32] with the Bom-Bethe theory [27]. BED requires the differential continuum oscillator strength (DOS) which is rather difficult to obtain. The simplest approximate version of BED is the binary-encounter-Bethe (BEB) [31] model, which does not need the knowledge of DOS for calculating the EISICS. 

It is notable that the photoionization cross sections does not appear in the BEB expression, although it is required in the Bethe model instead, a simple functional form has been assiuned (Kim and Rudd, 1994). A more elaborate model that does incorporate the photoionization cross section, referred to as the binary-encounter-dipole (BED) model, was also proposed by Kim and Rudd (1994). The BED model is suitable for calculation not only of the total ionization cross section but of the singly differential cross section, i.e., the eross section for a... 

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