TY - JOUR
T1 - Impact of keV-energy argon clusters on diamond and graphite
AU - Popok, Vladimir
AU - Samela, Juha
AU - Nordlund, Kai
AU - Popov, Vladimir P.
PY - 2012/7/1
Y1 - 2012/7/1
N2 - Impact of keV-energy size-selected Arn (n = 16, 27, 41) cluster ions on diamond and graphite is studied both experimentally and by molecular dynamics simulations. For the case of diamond, relatively high cluster kinetic energies (above certain threshold) are required to produce severe radiation damage and originate crater formation on the surface. This is related to very strong chemical bonds and both the melting (or sublimation) point and thermal conductivity of diamond being the highest among the solids. For the case of graphite, which is layered material with weak van der Waals bonds between the graphene planes, significant radiation damage is already introduced by impact of clusters with low kinetic energies (a few tens of eV/atom). However, collisions of the argon clusters cause very elastic response of the graphene planes that leads to efficient closure of the craters which could be formed at the initial stage of impact.
AB - Impact of keV-energy size-selected Arn (n = 16, 27, 41) cluster ions on diamond and graphite is studied both experimentally and by molecular dynamics simulations. For the case of diamond, relatively high cluster kinetic energies (above certain threshold) are required to produce severe radiation damage and originate crater formation on the surface. This is related to very strong chemical bonds and both the melting (or sublimation) point and thermal conductivity of diamond being the highest among the solids. For the case of graphite, which is layered material with weak van der Waals bonds between the graphene planes, significant radiation damage is already introduced by impact of clusters with low kinetic energies (a few tens of eV/atom). However, collisions of the argon clusters cause very elastic response of the graphene planes that leads to efficient closure of the craters which could be formed at the initial stage of impact.
KW - cluster ion implantation, craters, hillocks, scanning probe microscopy, molecular dynamics simulations
UR - http://www.scopus.com/inward/record.url?scp=84861651854&partnerID=8YFLogxK
U2 - 10.1016/j.nimb.2011.08.055
DO - 10.1016/j.nimb.2011.08.055
M3 - Journal article
SN - 0168-583X
VL - 282
SP - 112
EP - 115
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
ER -