Energy loss of ions in Zinc oxide

C. C. MONTANARI; R. C. FADANELLI; A. TUROS; D. MITNIK; C. D. NASCIMENTO; E. GUZIEWICZ; J. C. AGUIAR; M. BEHAR

Buenos Aires

Congreso; MESBA2016, Molecular Electronic Structure; 2016

Instituto de Astronomía y Física del Espacio, CONICET-UBA

We present a theoretical and experimentalresearch on the the energy loss of H and Heions in zinc oxide [1]. We used the density func-tional theory (DFT) to obtain the molecular de-scription of ZnO as crystal solid, electronic wavefunctions and binding energies.These values were tested by calculating theenergy loss of H and He ions passing through aZnO foil using the shelwise local plasma approxi-mation (SLPA). The starting points of the SLPAare the electronic densities of each shell and thecorresponding energy gaps. The experimentalenergy loss measurements were carried out atthe facility of the Instituto de F¶³sica da Univer-sidade Federal do Rio Grande do Sul, in Brazil,using the Rutherford Backscattering Techniquefor (300-2000) keV H ions and (300-5000) keVHe ions. The equilibrium charge state of He in-side ZnO is analyzed based on the present stop-ping measurements, and a semiempirical distri-bution is proposed.Our experimental and theoretical valuesshow good agreement for both the stopping andthe straggling, with the latter being highly sen-sitive to the homogeneity of the foil. We alsocompare the present stopping data with CasP5.2[2] and with SRIM2013 [3] values.References[1] R. C. Fadanelli, C. D. Nascimento, C. C.Montanari, J. C. Aguiar, D. Mitnik, A.Turos, E. Guziewicz, and M. Behar, et al,Eur. Phys. J. D (2016) in press.[2] G. Schiwietz and P. L. Grande et al, Nucl.Instr. and Meth. B 175, 175 (2001).[3] J. F. Ziegler, J. P. Biersack, and U.Littmark, et al, The stopping and Range ofions in solids (Pergamon Press,1985).