Energy loss of swift H and He projectiles in Al, Si, Ni and Cu targets

Abstract

We have calculated the stopping power of Al, Si, Ni and Cu for swift H and He ion beams. Furthermore, the energy loss straggling corresponding to Ni is also evaluated. The dielectric formalism is used combined with the MELF‐GOS method, which describes the energy loss function of the target by a linear combination of Mermin type energy loss functions for the electron outer‐shell electrons and by generalized oscillator strengths for the electron inner‐shell electrons. We take into account the corrections to the stopping power associated to capture and loss of electrons by the projectile as well as the polarization of the projectile charge density. The versatility of this method is illustrated by the good agreement between their predictions and the experimental results, which is observed for a wide range of projectile energies and targets with different electronic properties. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Evaluations of proton inelastic mean free paths for 12 elemental solids over the energy range from 0.05 to 10MeV

“…Recently, two groups, Sigmund and Schinner [24] and Denton et al [25], presented the calculations of the SPs of several elemental solids for H projectiles. For these calculations Sigmund and Schinner used the binary theory based on the modifications for the Bohr's classical theory [26] and Denton et al applied the dielectric formalism.…”

“…data [10] Denton et al [25] (b) Ni 0 10 20 30 SPBorn SP Tabulated values [11] Fit to Expt. data [10] Denton et al [25] (c) Cu SPBorn SP Tabulated values [11] Fit to Expt. data [10] (d) Ag 0 10 20 30 SPBorn SP Tabulated values [11] Fit to Expt.…”

“…SPBorn SP Tabulated values [11] Binary theory [24] Denton et al [25] (a) Al SPBorn SP Fit to Expt. data [10] Denton et al [25] (b) Ni 0 10 20 30 SPBorn SP Tabulated values [11] Fit to Expt. data [10] Denton et al [25] (c) Cu SPBorn SP Tabulated values [11] Fit to Expt.…”

“…In the binary theory due to Sigmund and Schinner [24], the charge states of the projectile inside the target, the influence of screening of the projectiles-target interaction by accompanying electrons, the shell correction and the Barkas and Bloch corrections are included. In dielectric model of Denton et al [25], the charge states of the projectile inside the target, the effect of the polarization of the projectile and the SP due to the electronic capture and loss events are taken into account. The SPs of Al, Ni and Cu for H projectiles calculated by these two groups are also presented in Fig.…”

“…Comparisons between the calculated stopping powers (SP Born s and SP) and those from the fit to experimental (Expt.) data [10], the tabulated values [11], and the evaluations of both Sigmund and Schinner [24] and Denton et al [25] as the functions of proton energy for (a) Al, (b) Ni, (c) Cu, (d) Ag, and (e) Au.…”