Synergy between thermal spike and exciton decay mechanisms for ion damage and amorphization by electronic excitation
نویسندگان
چکیده
F. Agulló-López,1,2,* A. Mendez,1,2 G. García,1,† J. Olivares,3,1 and J. M. Cabrera2 1Centro de Microanálisis de Materiales (CMAM), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain 2Departamento de Física de Materiales, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain 3Instituto de Óptica “Daza de Valdés,” CSIC, 28004 Madrid, Spain Received 9 August 2006; published 14 November 2006
منابع مشابه
The initial production of defects in alkali halides: F and H centre production by non-radiative decay of the self-trapped exciton
Radiation damage in KCl can be produced by the decay of a self-trapped exciton into an F centre and an H centre. We present calculations of the energies of the states involved for various stages in the evolution of the damage. These lead to important conclusions about the very rapid damage process, and support strongly Itoh and Saidoh’s suggestion that damage proceeds through an excited hole st...
متن کاملCoulomb explosion and thermal spikes.
A fast ion can electronically excite a solid producing a track of damage, a process initially used to detect energetic particles but now used to alter materials. From the seminal paper by Fleischer et al. [Phys. Rev. 156, 353 (1967)] to the present, "Coulomb explosion" and thermal spike models have been often treated as competing models for describing ion track effects. Here molecular dynamics ...
متن کاملExciton–erbium interactions in Si nanocrystal-doped SiO2
The presence of silicon nanocrystals in Er doped SiO2 can enhance the effective Er optical absorption cross section by several orders of magnitude due to a strong coupling between quantum confined excitons and Er. This article studies the fundamental processes that determine the potential of Si nanocrystals as sensitizers for use in Er doped waveguide amplifiers or lasers. Silicon nanocrystals ...
متن کاملElectronic excitation induced amorphization in titanate pyrochlores: an ab initio molecular dynamics study
The response of titanate pyrochlores (A2Ti2O7, A = Y, Gd and Sm) to electronic excitation is investigated utilizing an ab initio molecular dynamics method. All the titanate pyrochlores are found to undergo a crystalline-to-amorphous structural transition under a low concentration of electronic excitations. The transition temperature at which structural amorphization starts to occur depends on t...
متن کاملMolecular dynamic simulation of low-energy FIB irradiation induced damage in diamond
In this article, a large scale multi-particle molecular dynamics (MD) simulation model was developed to study the dynamic structural changes in single crystal diamond under 5 keV Ga irradiation in conjunction with a transmission electron microscopy (TEM) experiment. The results show that the thickness of ion-induced damaged layer (~ 9.0 nm) obtained from experiments and simulations has good acc...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2006