DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Jung, Kyung-Hoon | - |
dc.contributor.advisor | 정경훈 | - |
dc.contributor.author | Lee, Sung-Hae | - |
dc.contributor.author | 이성해 | - |
dc.date.accessioned | 2011-12-13T04:47:13Z | - |
dc.date.available | 2011-12-13T04:47:13Z | - |
dc.date.issued | 1999 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=151681&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/31822 | - |
dc.description | 학위논문(석사) - 한국과학기술원 : 화학과, 1999.2, [ vi, 31 p. ] | - |
dc.description.abstract | Bond cleavages of alkyl halides with two chromophores progress competitively and produce a number of fragments via various paths. We select $CF_2ClBr$ and $CH_2ClBr$ to see the effect of two absorption parts. In the photodissociations of $CF_2ClBr$ and $CH_2ClBr$ near 234nm, the branching ratios are obtained using REMPI-TOF-MS and velocity distributions are measured using REMPI-imaging technique. The relative quantum yields of $CF_2ClBr$ are Φ(Br)=0.53, $\phi(Br^*)=0.22$, Φ(Cl)=0.17, and $\phi(Cl^*)=0.08$ respectively, and the branching ratio of C-Br to C-Cl is about 3. The $CF_2Cl+Br$ channel reveals a direct mode of dissociation and the $CF_2Br+Cl$ channel does an indirect mode. The relative quantum yields of $CH_2ClBr$ are Φ(Br)=0.56, $\phi(Br^*)=0.26$, Φ(Cl)=0.12, and $\phi(Cl^*)=0.07$, respectively, and the branching ratio of C-Br to C-Cl is about 4.6. The dissociation of $CH_2ClBr$ shows similar to that of $CF_2ClBr$. The $CH_2Cl+Br$ channel is a direct dissociation, whereas $CH_2Br+Cl$ is an indirect dissociation. The fission of the weakest bond C-Br is the dominant process for both molecules. Ground state halogen atoms are about 2 times more generated than spin-orbit excited state atoms. On the contrary, the branching ratio is somewhat different. The secondary reaction of $CF_2Cl$ and $CH_2Br$ radicals made an effect on the ratio. | eng |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | Imaging | - |
dc.subject | Photodissociation | - |
dc.subject | alkyl halide | - |
dc.subject | 이미지 | - |
dc.subject | 알킬할라이드 | - |
dc.subject | 광분해 | - |
dc.title | Photodissociation of alkyl halides with two chromophores near 234nm | - |
dc.title.alternative | 두 발색단을 가지는 알킬 할라이드 분자의 234nm에서의 광분해 반응 | - |
dc.type | Thesis(Master) | - |
dc.identifier.CNRN | 151681/325007 | - |
dc.description.department | 한국과학기술원 : 화학과, | - |
dc.identifier.uid | 000973497 | - |
dc.contributor.localauthor | Jung, Kyung-Hoon | - |
dc.contributor.localauthor | 정경훈 | - |
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