Eur. Phys. J. D (2016) 70: 178
https://doi.org/10.1140/epjd/e2016-70179-4

Regular Article

Stopping and straggling of H and He in ZnO

¹ Laboratorio de Implantação Iônica, Instituto de Física, Universidade Federal do Rio Grande do Sul, Av. Bento Goncalves 9500, 91501-970 Porto Alegre, Brazil
² Instituto de Astronomía y Física del Espacio (CONICET-UBA), and Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, casilla de correo 67, Sucursal 28, C1428EGA Buenos Aires, Argentina
³ Autoridad Regulatoria Nuclear, Av. Libertador 8250, C1429BNP Buenos Aires, Argentina
⁴ Institute of Electronic Materials Technology, Wólczyńska 133, 01-919 Warsaw, Poland
⁵ National Centre for Nuclear Research, Soltana 7, 04-500 Otwock, Poland
⁶ Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland

^a e-mail: mclaudia@iafe.uba.ar

Received: 8 March 2016
Received in final form: 4 May 2016
Published online: 1 September 2016

Abstract

We present experimental and theoretical values for the energy loss of H and He ions in Zinc oxide, in mean value (stopping per unit path length) and mean square value (energy loss straggling). The measurements were carried out using the Rutherford Backscattering technique for (300–2000) keV H ions and (300–5000) keV He ions. Present experimental data are the first set of stopping and straggling values in this oxide. The theoretical research was encouraged considering the molecular description of ZnO as crystal solid using the density functional theory. The energy loss calculations for H and He ions with different charge states were performed with the shelwise local plasma approximation (SLPA). The molecular versus the Bragg-rule description is also discussed. The equilibrium charge state of He inside ZnO is analyzed based on the present stopping measurements, and a semiempirical charge state distribution is proposed. Present experimental and theoretical values show good agreement for both the stopping and the straggling. We also compare our data with the SRIM2013 and with CasP5.2 values.