Color center creation in LiF crystals irradiated with 5- and 10-MeV Au ions
- 作者：K. Schwartz ; M.V. Sorokin ; A. Lushchik ; Ch. Lushchik ; E. Vasil´ ; chenko ; R.M. Papaleo ; D. de Souza ; A.E. Volkov ; K.-O. Voss ; R. Neumann ; C. Trautmann
- 关键词：Ionic crystals ; Radiation damage ; Color centers ; Ion tracks ; δ ; electrons ; Electronic excitations of the lattice
- 刊名：Nuclear Instruments and Methods in Physics Research Section B ; Beam Interactions with Materials and Atoms
- 出版年：2008
- 期刊代码：42_0168583x
- 类别：ph
- 出版时间：June 2008
- 卷：266
- 期：12-13
- 页码：2736-2740
- 文件大小：202 K
摘要
The peculiarities of defect creation in LiF crystals by irradiation with 5- and 10-MeV Au ions have been studied using optical spectroscopy. The crystals were irradiated at room temperature with fluences from 1 × 1012 to 2 × 1014 ions/cm2 at various beam current densities (1–200 nA/cm2). The short ion range in LiF allowed measurements for higher absorbed energy densities and high defect volume concentration. The efficiency of single F center and Fn and larger aggregate creation depends drastically both on ion fluence and flux (beam current). Color center creation is less effective for 5-MeV Au ions than for 10-MeV Au ions, which produce δ electrons with energies sufficient for creation of cation excitons (
62 eV). The peculiarities of color center accumulation in LiF crystals under MeV Au ion irradiation are considered taking into account the nonlinear kinetics of interstitials (H centers).
62 eV). The peculiarities of color center accumulation in LiF crystals under MeV Au ion irradiation are considered taking into account the nonlinear kinetics of interstitials (H centers).