Stopping of 0.3–1.2MeV/u protons and alpha particles in Si

Abstract

The stopping cross sections  (E) of silicon for protons and alpha particles have been measured over the velocity range (0.3-1.2) MeV/u from a Si//SiO2//Si (SIMOX) target using the Rutherford Backscattering Spectrometry (RBS) with special emphasis put on experimental aspects. A detection geometry coupling simultaneously two solid-state Si detectors placed at 165° and 150° relative to each side of the incident beam direction was used to measure the energies of the scattered ions and determine their energy losses within the stopping medium. In this way, the basic energy parameter, Ex, at the Si/SiO2 interface for a given incident energy E0 is the same for ions backscattered in the two directions off both the Si and O target elements, and systematic uncertainties in the  (E) data mainly originating from the target thickness are significantly minimized. A powerful computer code has been elaborated for extracting the relevant  (E) experimental data and the associated overall uncertainty that amounts to less than 3%. The measured  (E) data sets were found to be in fair agreement with H. Paul's compilation and with values calculated by the SRIM 06 computer code. In the case of 4 He + ions, experimental data for the -effective charge parameter have been deduced via scaling the measured stopping cross sections to those for protons crossing the same target at the same velocity and compared to the predictions of the SRIM 06 code. It is found that the -parameter values generated by the latter code slightly deviate from experiment over the velocity region around the stopping cross section maximum where strong charge exchanges usually occur.

Low- and intermediate-energy stopping power of protons and antiprotons in solid targets

“…8 is very good from the very low to the high energies. This is more noticeable if we focus on the latest experimental measurements: the low energy data by Hobbler et al in 2006 [35] (letter "a" in region I), by Fama et al in 2002 [36] (letter "W" in regions I and II), and the high energy data by Abdesselam et al in 2008 [74] (letter "b" in regions II and III). Instead, the measurements by Konac et al in 1998 [75] (letters "Y" and "Z") are too low for v < 0.7.…”

İnce Cu2ZnSnS4 (CZTS) filmin RBS spektrumundan enerji kaybı analizi

“…stopping power was expanded to the power series of the energy using the least squares method with iteration [7]:…”

Stopping powers and energy loss straggling for (0.9–3.4) MeV protons in a kapton polyimide thin film

“…The energy loss and energy loss straggling measurements were carried out at the Algiers 3.75-MV Van de Graaff accelerator whose energy calibration has been checked [16] by exploring narrow resonances in the 19 F(p, ¡ ) 16 O and 27 Al(p, ) 28 Si nuclear reactions. A primary proton beam with energy in the range 0.9 3.4 MeV, mean current intensity of ~30 nA and circular spot of ~1.5 mm diameter was directed onto a very thin Au-Si scattering target through a series of electrostatic lenses and focusing slits.…”

“…The ion mean energy loss and energy loss straggling variance are statistical quantities of crucial importance regarding both the understanding of the fundamental aspects of ion-matter interactions and ion beam analysis various applications [1][2][3][4][5][6][7][8]. The ion mean energy loss per travelled path length, i.e., the target material stopping power, , has been extensively investigated for various ion-target combinations over a wide range of ion bombarding energies [9][10][11][12][13][14][15][16][17][18][19]. In contrast, the energy loss straggling variance, Ω…”