Investigation of the effects of high-energy proton-beam irradiation on metal-oxide surfaces by using methane adsorption isotherms
- Authors
- Kim, Euikwoun; Lee, Junggil; Kim, Jae Yong; Kim, Kyeryung
- Issue Date
- Jul-2012
- Publisher
- KOREAN PHYSICAL SOC
- Keywords
- Adsorption; Proton beam; MgO; Methane
- Citation
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.61, no.2, pp.278 - 281
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY
- Volume
- 61
- Number
- 2
- Start Page
- 278
- End Page
- 281
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/144742
- DOI
- 10.3938/jkps.61.278
- ISSN
- 0374-4884
- Abstract
- The creation of possible local defects on metal-oxide surfaces due to irradiation with a high-energy proton beam was investigated by using a series of gas adsorption isotherms for methane (CH4) on a MgO powder surface. After a MgO powder surface having only a (100) surface had been irradiated with a 35-MeV proton beam, the second atomic layer of methane had completely disappeared while two distinct atomic layers were found in a layer-by-layer fashion on the surfaces of unirradiated samples. This subtle modification of the surface is evidenced by a change of the contrasts in the morphologies measured a using a transmission electron microscopy. Combined results obtained from an electron microscopy and methane adsorption isotherms strongly suggest that the high-energy proton-beam irradiation induced a local surface modification by imparting kinetic energy to the sample. The calculation of the 2-dimensional compressibility values, which are responsible for the formation of the atomic layers, confirmed the surface modification after irradiating surface-clean MgO powders with a proton beam.
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