DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Kim, Se-Hun | - |
dc.contributor.advisor | 김세훈 | - |
dc.contributor.author | Kim, An-Soon | - |
dc.contributor.author | 김안순 | - |
dc.date.accessioned | 2011-12-13T04:48:15Z | - |
dc.date.available | 2011-12-13T04:48:15Z | - |
dc.date.issued | 2001 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=165999&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/31889 | - |
dc.description | 학위논문(석사) - 한국과학기술원 : 화학과, 2001.2, [ ix, 51 p. ] | - |
dc.description.abstract | The adsorption and thermal desorption of acetylene on Ge(100) have been studied in ultrahigh vacuum by Auger electron spectroscopy (AES), temperature-programmed desorption (TPD), and low energy electron diffraction (LEED). Acetylene is found to chemisorb and to desorb molecularly on Ge(100) via a mobile precursor in a different way with Si(100) on which chemisorbed acetylene was found to undergo two thermal reactions; a minor pathway (molecular desorption) and a major pathway (dissociation of acetylene). The difference between activation energy for desorption from the precursor and that for reaction from the precursor into the chemisorbed state is found to be ($E_p$ - $E_c$) = 3.6 ± 0.23 kcal/mol. TPD measurements show that two molecular desorption features at all coverages, indicating that at least two adsorption states can be formed. For desorption kinetics, $C_2H_2$ desorption is first order reaction and the activation energies for desorption at saturation coverage are 30.6 kcal/mol for $α_1$ state and 32.9 kcal/mol for $α_2$ state whereas the energy for desorption of acetylene from Si(100) was found to be 46.1 ± 2.0 kcal/mol. The lower desorption activation energy allows $C_2H_2$ to desorb prior to significant dissociation which is a major pathway in desorption from Si(100). The angular distrbution of $C_2H_2$ desorption is peaked at surface normal. The results are discussed on the basis of bonding geometry. From the retention of 2$\times$1 LEED patterns as increasing the $C_2H_2$ coverage, it is also concluded that $C_2H_2$ on Ge(100) chemisorbs molecularly. | eng |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | desorption mechanism | - |
dc.subject | adsorption mechanism | - |
dc.subject | acetylene | - |
dc.subject | Ge(100) | - |
dc.subject | surface reaction | - |
dc.subject | 표면위의 반응 | - |
dc.subject | 탈착 메커니즘 | - |
dc.subject | 흡착 메커니즘 | - |
dc.subject | 아세틸렌 | - |
dc.subject | Ge(100) | - |
dc.title | Adsorption and desorption of acetylene on Ge(100) | - |
dc.title.alternative | Ge(100) 표면 위의 아세틸렌 흡착과 탈착에 관한 연구 | - |
dc.type | Thesis(Master) | - |
dc.identifier.CNRN | 165999/325007 | - |
dc.description.department | 한국과학기술원 : 화학과, | - |
dc.identifier.uid | 000993116 | - |
dc.contributor.localauthor | Kim, Se-Hun | - |
dc.contributor.localauthor | 김세훈 | - |
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