On the determination of energy losses by charged particles from the backscattered energy spectra

Abstract

Estimates of the influence of multiple scattering, straggling, and target‐surface roughness on the backscattering yield of charged particles are presented. The formulae derived for the backscattering yield, which take into account the above factors, give a satisfactory description of the spectra of protons backscattered from W and Ge targets that are measured at incident proton energies E0 of 0.3, 0.5, and 6.3 MeV. The deduced dependence of the multiple scattering contribution on the Rutherford scattering angle makes it possible to eliminate the influence of multiple scattering on the results of determination of the specific energy losses of charged particles from the backscattered spectra. Values are given of the energy losses of protons in W in the energy region 0.1 to 5.5 MeV and in Ge in the energy region 0.1 to 0.45 MeV, which are obtained from the backscattered proton spectra.

Experimental electronic stopping cross section of transition metals for light ions: Systematics around the stopping maximum

“…The experimental procedure is based on the fact [38] that the height of the backscattering spectrum of a given sample contains information on the stopping power [39]. Different from previous works-where the stopping power was basically deduced directly from the spectrum height of a sample [40][41][42]-we have deduced the stopping data relative to reference samples with similar atomic number and well-known stopping power values (in this work: Cu, Ag, and Au). As an example, the backscattering spectrum of a material of interest (e.g., Ta) is recorded relative to a reference sample (e.g., Au), and the ratio of the spectrum heights H Expt Ta /H Expt Au is compared to the ratio obtained from the simulations H Sim Ta /H Sim Au using Monte Carlo TRBS [43] and SIMNRA [44] codes.…”

Experimental electronic stopping cross section of tungsten for light ions in a large energy interval

“…[57][58][59][60] are shown in panel (a), with stated uncertainties varying within 3-10 % (black open symbols). In general, literature data agrees well with our results, within the uncertainties and energy range ≈ [80-6000] keV.…”