Direct observation of the primary state of damage of ion-irradiated tungsten. II. Definitions, analyses and results

Abstract

Abstract In a previous paper (Wei, Current and Seidman 1981) the results of an extensive field-ion microscope investigation of the vacancy portion of the primary state of damage of ion-irradiated tungsten specimens were presented. The vacancies were contained in depleted zones (DZs) which had been created, at ≤ 15 K, by a variety of single projectile ions with initial energies in the range 15 to 70 keV. In this paper (Part II) the definitions of all the principal quantities used to characterize the three-dimensional vacancy population within a DZ are presented; that is, the number of vacancies, the average diameter and orientation of a DZ with respect to the incident ion beam, the average vacancy concentration within a DZ, the radial distribution functions and the first-nearest-neighbour cluster functions. All the DZs are analysed in great detail, using these principal quantities, and the results are presented in graphical form. In addition, many other detailed physical proporties of DZs are presented.