Song, Jae-Hoon Choi, Duck-Kyun Choi, Won-Kook 2024-01-21T11:34:58Z 2024-01-21T11:34:58Z 2021-09-04 2001-12 1567-1739 https://pubs.kist.re.kr/handle/201004/140017 An assembled CO2 gas cluster ion beam system was assessed using a retarding field analyzer and a time-of-flight mass spectrometer. The CO2 gas was expanded to form gas clusters at the input pressure of 1-5 bar through a quartz Laval nozzle. At 4 bar, it is confirmed that the clusters consisted of about 500 molecules. Also the dependence of the mean cluster size distribution on source temperature was examined. At the low fluence of ion beam, an isolated gas cluster ion impact on solid surfaces was investigated. CO2 gas cluster ions were irradiated at the acceleration voltage of 40-60 kV on highly oriented pyrolytic graphite. Si with native oxide layers, and Cu film deposited on Si wafer. After very short exposure of cluster ions, induced hillocks with about 0.8-1 nm in height and 20 nm in width were outgrown from the impacted surfaces. After prolonged irradiation on Si and Cu/Si, humping was more developed and consequently the surface morphology seemed to be saturated because of gradual filling the gap between the hillocks. (C) 2001 Published by Elsevier Science B.V. English ELSEVIER SCIENCE BV A gas cluster ion beam accelerator Article 10.1016/S1567-1739(01)00067-0 1 CURRENT APPLIED PHYSICS, v.1, no.6, pp.521 - 528 CURRENT APPLIED PHYSICS 1 6 521 528 scie scopus 000208321200013 2-s2.0-0012802199 Materials Science, Multidisciplinary Physics, Applied Materials Science Physics Article Gas cluster Time-of-flight Retarding field analyzer Isolated impact