Determination of the difference between the mean and the most probable energy loss of low-energy proton beams traversing thin solid foils

Impact of the experimental approach on the observed electronic energy loss for light keV ions in thin self-supporting films

“…In transmission geometry information on the electronic stopping can be obtained from the position of the peak of transmitted particles Ef (either the most probable or the mean energy loss) via the total energy loss ΔE in the film: ΔE = (E0 -Ef). For low primary energies only small deviations (≤ 1.5 %) between evaluations of the mean or most probable energy loss were found [24]. In the spectrum of backscattered projectiles, the width ΔE' of the Au peak contains information on the total energy loss of the projectile in the film with ΔE' = k ‫﮲‬ ΔEin + ΔEout, with the kinematic factor k. Note, here both the energy loss on the incoming ΔEin and exiting trajectory ΔEout contribute.…”

Neutral solar wind generated by lunar exospheric dust at the terminator

“…Ions traversing through matter lose energy by a sequence of stochastic processes which result in an energy loss and dispersion. Typically at incident energies around 4 keV, proton beams traversing solid foils between 0.01 and 0.03 mm thickness will emerge with $3 keV with energy dispersions of the order of a few hundred eV [Figueroa et al, 2007]. So, the observed energy distribution of the lunar dust-generated neutral solar wind will have lower energies than that of the solar wind and will be substantially hotter.…”

Band structure effects in the energy loss of low-energy protons and deuterons in thin films of Pt

“…As shown in the figure, one obtains for higher energies an excellent fitting using a Gaussian distribution function. The symmetry of the spectrum in this energy range is a characteristic of the transmission method and, is the basis for accurate determinations of ion energy losses in thin foils [27]. At lower energies (D þ 2 fragments), the distribution shows an increase of the low-energy tail of the spectrum corresponding to higher electronic energy losses produced by pathlength increases due to the multiple scattering of the beam particles in the medium.…”