Effective stopping charges and stopping power calculations for heavy ions

Abstract

In this study the model suggested by Sugiyama has been developed and applied for the calculation of the stopping powers for nonrelativistic heavy ions in various target materials. Sugiyama's model has been expanded to low and high energy regions in our work. Analytical expressions are obtained in the modified BB stopping power formula for the effective charge and effective mean excitation energies. In the modified LSS formula, a quasi-molecule criterion has been applied to both the projectiles and the target atoms. Electronic excitation contribution, S e0 , and quasi-molecule contribution, S ei , to stopping power were found for a wide energy region. It is observed that in intermediate energy region both contributions have maxima. The stopping power due to excitation-ionization in the intermediate and higher energy region is found to be dominant, whereas quasi-molecule contribution is dominant in the lower energy region. The calculated results of stopping power are in good agreement with experimental data for various ions and targets within a few percent in a wide projectile energy range.

Electron interaction with DNA constituents in aqueous phase

“…Their results underestimate all the available data including present ones for the energy above 70 eV. Gümüş and Bentabet [33] reported the MSP values for the energy 10-10 7 eV by extending the semi-empirical model [63,64] to give MSP data for gaseous bioorganic compounds, whereas the present data deals with the aqueous phase of the target molecule. Thus, the deviation of their data with the present values can be understood.…”

Range and longitudinal range straggling with various stopping power formulations for oxygen ions in Si and SiO2

“…Another electronic stopping-power formula is proposed by one of the author's in an earlier work, Gümüş and Köksal (GK) [17] for fast heavy ions, which is given as in the following. The electronic stopping power of a fast heavy ion of effective charge 1 * Z e and velocity v 1 , passing through a stopping medium is given by the modified Bethe formula within the first-order Born approximation,…”

“…In addition, we show the predictions of Ziegler, Biersack and Littmark (ZBL) as provided by the subroutine RSTOP of the program SRIM2003 version 26 [2]. Experimental data are shown as letters taken from Sa92 [32], Ga87 [33], Kel73 [34], Jia99 [35], Hof76 [36], Ara02 [37], Zha03a [38]. Concerning the Si target, an inspection of Fig.…”

“…where [17]. The electronic stopping power for all energy region, e S , can be expressed as the sum of the excitationionization and the quasimolecule contributions.…”

Avukatin Müvekki̇li̇ni̇n Ki̇şi̇sel Sağlik Veri̇leri̇ne Eri̇şi̇mi̇ne İli̇şki̇n Değerlendi̇rmeler

“…maddesinde yer verilen tamamlayıcı norm ile doldurulur. 20 Anılan madde uyarınca vekâletin kapsamı, sözleşmede açıkça belirtilmemişse, görülecek işin niteliğine göre saptanır.…”