| 研究生: |
林建勳 Lin, Jian-Shiun |
|---|---|
| 論文名稱: |
2-溴乙酸和2-碘乙酸在Cu(100)表面上的熱化學 Thermal chemistry of bromoacetic acid and iodoacetic acid on Cu(100) |
| 指導教授: |
林榮良
Lin, Jong-Liang |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 化學系 Department of Chemistry |
| 論文出版年: | 2007 |
| 畢業學年度: | 95 |
| 語文別: | 中文 |
| 論文頁數: | 56 |
| 中文關鍵詞: | 2-溴乙酸 、熱化學 、2-碘乙酸 |
| 外文關鍵詞: | iodoacetic acid, thermal chemistry, Cu(100), bromoacetic acid |
| 相關次數: | 點閱:87 下載:5 |
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本篇論文研究超高真空系統中溴乙酸(BrCH2COOH)以及碘乙酸(ICH2COOH)於Cu(100)單晶上熱分解的表面中間物及反應的氣相產物。所用的分析技術為程序控溫反應/脫附,歐傑電子譜和反射式吸收紅外光譜。低曝露量時(<0.5 Langmuir(L)),BrCH2COOH實驗中,BrCH2COOH分解過城中可能先斷裂C-Br鍵並且形成-CH2COOH的表面中間物,升溫至~300 K後,CH2COOH的O-H鍵斷裂,再經重組後生成acetate(CH3COO),最後在約540 K產生CH3COOH、CH2=C=O、CO2、CO以及H2O的氣象產物脫附。當曝露量增加時(≧0.5 L),開始出現BrCH2COOH脫附(~230 K),但也分解形成-CH2COOH的中間產物,然而表面高覆蓋率並不會於~300 K形成acetate。CH2=C=O和CH3COOH氣相產物約於310~450 K之間脫附,但它們的生成量與低覆蓋率相比減少許多。高附概率的另外也有CO2和H2O生成,它們的脫附出現在445 K和640 K。ICH2COOH的熱反應過程與BrCH2COOH相似。在有氧原子覆蓋的Cu(100)表面上, BrCH2COOH(低暴露量時)約在510 K也分解,生成CH3COOH、CH2=C=O、CO2、CO和H2O的氣相產物。
Temperature-programmed reaction/adsorption, Auger electron spectro- scopy and reflection-adsorption infrared spectroscopy have been employed to investigate the thermal reactions of bromoacetic acid (BrCH2COOH) and iodoacetic acid(ICH2COOH) on Cu(100). At low exposures(<0.5 L), BrCH2COOH may dissociate through C-Br bond breakage at forming the intermediate of -CH2COOH on Cu(100). After rearrangement, acetate (CH3COO) is formed at 300 K. The acetate does not decompose until ~540 K. The reaction gaseous products are H2O, CO2, CO, CH3COOH and CH2=C=O. At higher exposures(≧0.5 L), the same intermediate, -CH2COOH, is generated, but it does not transform into acetate at ~300 K. The yields of CH2=C=O and CH3COOH are smaller than those observed in cases of lower exposures (0.1 L and 0.3 L). These two reaction products desorb between 310 and 450 K. In addition, CO2 and H2O are generated at 445 K and 640 K. BrCH2COOH and ICH2COOH undergo similar thermal reactions on Cu(100). On an oxygen-precovered on Cu(100) surface, BrCH2COOH also dissociates and products CH3COOH, CH2=C=O, CO2, CO, and H2O at a temperature of ~510 K.
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