Estimation of dielectric constant by using mirror effect

Abstract

An experimental-theoretical investigation has been presented in this paper to study of the ion mirror effect on the Poly Methyl Methacrylate (PMMA) sample, and how to control this effect and use it as an analytical tool for imaging in practical field was presented. This means creating a deeper understanding of the characteristics of ions beam related to the mirror effect. As a result, a mathematical relation for the beam properties of the sample surface has been adopted and realistic physical concepts must be constructed. Where the study of the effect of some parameters on the ion mirror effect was submitted, and these parameters are: the trapped charge quantity on the sample surface and acceleration voltage in the imaging process, a distance of work and irradiation area.The purpose of this study is to achieve a measurement of dielectric constant by using the mirror effect. Where a mathematical relation was derived to estimate the dielectric constant for any of insulating material by using the mirror effect, where it gave good results that correspond to a good extent with the practical results. This was done by knowing the scanning voltage for the disappearance of the mirror effect as well as measuring the Coulomb diameter for each scanning voltage.