Asymmetric line shapes for medium energy H and He ions undergoing a large-angle collision

Characterization of nanoparticles through medium-energy ion scattering

“…͑2͒ is calculated, using the parameter 2 for the energy-loss straggling along the incoming and outgoing paths K i 2 ͑⌰͒⌬W 2 in + ⌬W 2 out and the asymmetry parameter ␣ ͑or 0 −1 ͒ either from experiments 19 or from calculations. 18,26 ͑vi͒ For each ith element in the ͑x,y,z͒ composition, we calculate the yield through Eq.…”

“…18͒ can be used to describe asymmetrical energy losses found in MEIS experiments. 19 Indeed, the importance of the asymmetry of the energy loss in the characterization of nanoparticles is an important issue and was never investigated before, and as it will be shown in what follows, the use of Gaussian energyloss distribution may lead to important misinterpretations of the MEIS spectrum.…”

Skimming-trajectory effect for energy loss of medium-energy He ions passing along major crystal axes of KI(001) and RbI(001)

“…The surface peaks are decomposed into three scattering components from the top-, second-, and third-layer I and Rb atoms (solid curves). Note that the shadowing effect was weakened owing to large root-mean-square thermal vibration amplitudes expected from the low Debye temperature of 115 K. Here, we employed the EMG function as the line shape [12,13]. The best fit was obtained by assuming the energy differences ( E 1−2 ) of 520 ± 20 and 540 ± 30 eV between the scattering components from the top-and second-layer I and Rb atoms, respectively.…”

“…For this purpose, it is essential to see the hitting probability for the atoms of each layer as well as the line shape for each scattering component. Concerning the latter, we employed the exponentially modified Gaussian (EMG) line shape [12,13] and the Lindhard-Scharff formula [14] to calculate the energy straggling, whose reliabilities were confirmed experimentally in advance [13,[15][16][17]. The hitting probability for the atoms of each layer is calculated by Monte Carlo (MC) simulations of ion trajectories, which are explained in detail below.…”

Structural characterization of CdSe/ZnS quantum dots using medium energy ion scattering

“…16 The single collision parameter for the EMG function was obtained from CasP. 16,17 In Figure 1(a), we show one of the TEM images used to measure the QDs diameter distribution along with a higher resolution image, where the crystalline structure of the CdSe nucleus can be seen.…”