Abstract
The effects of single ion impacts on the surfaces of films of Au, Ag, In and Pb have been studied using in-situ transmission electron microscopy. On all these materials, individual ion impacts produce surface craters, in some cases, with associated expelled material. The cratering efficiency scales with the density of the irradiated metal. For very thin Au foils (≈20-50nm), in some cases individual ions are seen to punch small holes completely through the foil. Continued irradiation results in a thickening of the foil. The process giving rise to crater and hole formation and other changes observed in the thin foils has been found to be due to pulsed localised flow - i.e. melting and flow due to the thermal spikes arising from individual ion impacts. Experiments carried out on thin films of silver sandwiched between SiO2 layers have indicated that pulsed localised flow also occurs in this system and contributes to the formation of Ag nanoclusters in SiO2-a system of interest for its non-linear optical properties. Calculation indicates that, when ion-induced, collision cascades occur near surfaces (within ≈ 5nm) with energy densities sufficient to cause melting, craters are formed. Crater formation occurs as a result of the explosive outflow of material from the hot molten core of the cascade. Processes occurring in the sandwiched layer are less well understood.
| Original language | English |
|---|---|
| Pages (from-to) | 174-182 |
| Number of pages | 9 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 3413 |
| DOIs | |
| Publication status | Published - 17 Sep 1998 |
| Externally published | Yes |
| Event | Materials Modification by Ion Irradiation - Quebec, Que, Canada Duration: 15 Jul 1998 → 16 Jul 1998 |
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Radiation damage from single heavy ion impacts on metal surfaces. / Donnelly, Stephen E.; Birtcher, Robert C.
In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 3413, 17.09.1998, p. 174-182.Research output: Contribution to journal › Conference article
TY - JOUR
T1 - Radiation damage from single heavy ion impacts on metal surfaces
AU - Donnelly, Stephen E.
AU - Birtcher, Robert C.
PY - 1998/9/17
Y1 - 1998/9/17
N2 - The effects of single ion impacts on the surfaces of films of Au, Ag, In and Pb have been studied using in-situ transmission electron microscopy. On all these materials, individual ion impacts produce surface craters, in some cases, with associated expelled material. The cratering efficiency scales with the density of the irradiated metal. For very thin Au foils (≈20-50nm), in some cases individual ions are seen to punch small holes completely through the foil. Continued irradiation results in a thickening of the foil. The process giving rise to crater and hole formation and other changes observed in the thin foils has been found to be due to pulsed localised flow - i.e. melting and flow due to the thermal spikes arising from individual ion impacts. Experiments carried out on thin films of silver sandwiched between SiO2 layers have indicated that pulsed localised flow also occurs in this system and contributes to the formation of Ag nanoclusters in SiO2-a system of interest for its non-linear optical properties. Calculation indicates that, when ion-induced, collision cascades occur near surfaces (within ≈ 5nm) with energy densities sufficient to cause melting, craters are formed. Crater formation occurs as a result of the explosive outflow of material from the hot molten core of the cascade. Processes occurring in the sandwiched layer are less well understood.
AB - The effects of single ion impacts on the surfaces of films of Au, Ag, In and Pb have been studied using in-situ transmission electron microscopy. On all these materials, individual ion impacts produce surface craters, in some cases, with associated expelled material. The cratering efficiency scales with the density of the irradiated metal. For very thin Au foils (≈20-50nm), in some cases individual ions are seen to punch small holes completely through the foil. Continued irradiation results in a thickening of the foil. The process giving rise to crater and hole formation and other changes observed in the thin foils has been found to be due to pulsed localised flow - i.e. melting and flow due to the thermal spikes arising from individual ion impacts. Experiments carried out on thin films of silver sandwiched between SiO2 layers have indicated that pulsed localised flow also occurs in this system and contributes to the formation of Ag nanoclusters in SiO2-a system of interest for its non-linear optical properties. Calculation indicates that, when ion-induced, collision cascades occur near surfaces (within ≈ 5nm) with energy densities sufficient to cause melting, craters are formed. Crater formation occurs as a result of the explosive outflow of material from the hot molten core of the cascade. Processes occurring in the sandwiched layer are less well understood.
KW - Craters
KW - Ion irradiation
KW - Particle/solid interactions
KW - Thermal spikes
KW - Transmission electron microscopy (TEM)
UR - http://www.scopus.com/inward/record.url?scp=0032402515&partnerID=8YFLogxK
U2 - 10.1117/12.321946
DO - 10.1117/12.321946
M3 - Conference article
VL - 3413
SP - 174
EP - 182
JO - Proceedings of SPIE - The International Society for Optical Engineering
JF - Proceedings of SPIE - The International Society for Optical Engineering
SN - 0277-786X
ER -