TY - JOUR
T1 - Recoil ranges in ion-induced collision cascades
AU - Colla, Thomas J.
AU - Gades, Heinrich
AU - Urbassek, Herbert M.
AU - Averback, R. S.
N1 - Funding Information:
I still owe a debt of gratitude to my former Professor, Tuomo Mannermaa, who taught his students to focus on the grassroots level of human life in order to understand what theology is about. Through his shared wisdom it was easier to see Christ even in a totally different philosophical and religious setting. A second academic from the University of Helsinki, now at Lund University, Professor Mika Vähäkangas, has been my supervisor right from the beginning. Without his patience and knowledgeable advice about African theology I could have not succeeded. He also invited me to join his projects, “African Christian Identity; Construction of African Christian Identity as a Dialogue between the Local and the Global” and “Interpreting African Christianity—Anthropology and Theology in Dialogue.” The former enjoyed financial support from the Finnish Academy and the University of Helsinki where I was able to work as a full-time researcher and regularly meet with colleagues working on the same projects. Professor Vähäkangas’ energy in applying new ways of seeing constantly changing human realities and his academic interest are exemplary and encouraging.
PY - 1999/6
Y1 - 1999/6
N2 - Using molecular-dynamics simulation, we study the recoil atom ranges in collision cascades as a function of the recoil energy. We focus on cascades initiated by 1 keV ions in Cu and Cu-related model metals, in which the cohesive energy has been changed with respect to that of Cu. At high energies, E > 100 eV, the recoil range follows the prediction of linear cascade theory. At lower energies, the ranges are still considerable. In particular, we observe a 15% probability of atom relocation at the nominal displacement threshold; the relocation probability does not vanish even for 1 eV recoils. We attribute this feature to the moderate collision spike existing in the system. The cohesive energy of the material affects the ranges considerably; a decrease of the cohesive energy increases low-energy recoil ranges. On the other hand, the recoil density is only moderately influenced by the cohesive energy. We hence conclude that the strong mixing observed in ion-bombarded materials with small cohesive energy is due to the increased recoil ranges.
AB - Using molecular-dynamics simulation, we study the recoil atom ranges in collision cascades as a function of the recoil energy. We focus on cascades initiated by 1 keV ions in Cu and Cu-related model metals, in which the cohesive energy has been changed with respect to that of Cu. At high energies, E > 100 eV, the recoil range follows the prediction of linear cascade theory. At lower energies, the ranges are still considerable. In particular, we observe a 15% probability of atom relocation at the nominal displacement threshold; the relocation probability does not vanish even for 1 eV recoils. We attribute this feature to the moderate collision spike existing in the system. The cohesive energy of the material affects the ranges considerably; a decrease of the cohesive energy increases low-energy recoil ranges. On the other hand, the recoil density is only moderately influenced by the cohesive energy. We hence conclude that the strong mixing observed in ion-bombarded materials with small cohesive energy is due to the increased recoil ranges.
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U2 - 10.1016/S0168-583X(99)00217-7
DO - 10.1016/S0168-583X(99)00217-7
M3 - Conference article
AN - SCOPUS:0033516059
SN - 0168-583X
VL - 153
SP - 361
EP - 368
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
IS - 1-4
T2 - Proceedings of the 1998 4th International Conference on Computer Simulation of Radiation Effects in Solids (COSIRES)
Y2 - 15 September 1998 through 19 September 1998
ER -