| 摘要 |
The invention relates to methods for marking valuable articles, mainly precious stones, in particular cut diamonds and can be used for article identification. The inventive method for marking valuable articles consists in forming a mark image visible in reflected light on a polished surface by modifying the ions of a surface area to be marked by means of the ion beam having the given ion energy and, while modifying, in converting the structure of the surface layer of a base in such a way as to change the optical characteristics of the modified areas in comparison to the optical characteristics of the untreated areas of the surface to be marked. The area to be marked is modified by a pulsed ion beam through a stencil mask by ion implantation of a modifier into a crystal lattice in the marked area of the base surface layer without destructing covalent bonds between the lattice atoms, i. e. without breaking the original shape of said layer. The optical characteristics of the modified area are changed by using, in the form of a modifier, the material, the ions of which change the integral refraction index of the base material when they are implanted into the crystal lattice in the form of impurity additives. |
