L-shell X-ray production cross sections in Nd, Gd, Ho, Yb, Au and Pb for 25-MeV carbon and 32-MeV oxygen ions

Abstract

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K X-ray production by 12C4+ ion impact on selected elements

“…As mentioned previously (Fazinic et al, 1996) the ions within the target achieve the equilibrium charge state exponentially with target depth. The problem of the existence of a dependence between X-ray production cross sections and target thickness has been studied several times before, e.g., by Wheeler et al (1976); Gardner et al (1977); Knaf et al (1977); Andrews et al (1985). The most important conclusion of these papers is that X-ray production cross sections become nearly independent of the target thickness for targets thicker than 10 mg/cm 2 .…”

X-ray emission induced by 1.2–3.6 MeV Kr13+ions

“…Electron capture is the dominant mechanism for Z 1 ≤ Z 2 and v 1 « v 2S (v 1 is the projectile velocity and v 2S is the target inner-shell electron velocity). If projectiles with no K-shell vacancy, EC contribution can be negligible in target M-shell X-ray production crosssections (Andrews et al, 1987;Mehta et al, 1983). For Z 1 ≈ Z 2 and v 1 « v 2S , the molecular orbital model seems to be more suitable (Fano et al, 1965).Various theoretical formulations are available for DI, such as the plane wave born approximation (PWBA) (Mukoyama, 1986), binary encounter approximation (BEA) (Gryzinski, 1965), and semiclassical approximation (Hansteen et al, 1973).…”