| 研究生: |
廖耕潁 Liao, Keng-Ying |
|---|---|
| 論文名稱: |
以價帶光電子譜技術研究吸附在Si(111)-7×7 表面之CF2Cl2 分子之光解離 Photon-induced dissociation of CF2Cl2 adsorbed on Si(111)- 7×7 studied by valence–level photoemission spectroscopy |
| 指導教授: |
溫清榕
Wen, C.R. |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 物理學系 Department of Physics |
| 論文出版年: | 2007 |
| 畢業學年度: | 95 |
| 語文別: | 中文 |
| 論文頁數: | 73 |
| 中文關鍵詞: | 光解截面 、光電子譜技術 |
| 外文關鍵詞: | photoemission, photolysis cross section, CF2Cl2 |
| 相關次數: | 點閱:53 下載:1 |
| 分享至: |
| 查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報 |
本實驗是將氣體分子CF2Cl2吸附在Si (111) -7 × 7的表面上,再使用同步幅射中心編號08A1之LSGM(Low-energy spherical grating monochromator beamline)光束線輸出的光子照射在表面上
,利用光電子譜技術(PES)來探討表面上的光物理與光化學作用。我們採用能量為80 、98 、101 、110 及120 eV 的入射光子來引起吸附在Si表面上的CF2Cl2分子解離,並分析各個鍵結衰減的情況。我們從光電子能譜中發現此分子是以分子性的物理吸附於Si表面上。使用不同能量的光子照射,皆顯示吸附的CF2Cl2分子具有很高的光解截面。我們發現經過長時間的光子照射,Si表面上會殘留SiF、SiCl及SiC碎片,我們也推論其束縛能的位置。我們將CF2Cl2分子在不同能量的光子照射下得到的光解截面與乾淨Si的總電子產額譜圖(TEY)相比較,我們認為CF2Cl2分子的解離機制是DA或DD。
In order to study the photon induced reactions of CF2Cl2 adsorbed on Si (111)-7×7 at 30 K, monochromatic synchrotron radiation was used as the light source for measuring the photoelectron spectra. We present an analysis of the dissociation and bonding’s decay of CF2Cl2 adsorbed on Si surface using various photons (hν=80、98、101、110 and 120 eV). The valence-level PES spectra show that CF2Cl2 molecules physisorb on Si (111)-7×7 surface, and have high photolysis cross section. After high photon exposure the SiF、SiC and SiCl fragments are created on the Si surface, which show the peaks at -10 、-7.7 and -6 eV, respectively. The photolysis cross section as a function of various incident photon energy in the range of 80-120 eV shows a threshold at around 100 eV. comparing with the total electron yield (TEY) spectrum of the clean sislcon substrate, we found that the dissociation of CF2Cl2 was mainy due to the dissociative attachment (DA) and dipolar dissociation (DD) .
[1] H.Hertz, Ann. Phys.31, 983(1887).
[2] A. Einstein, Ann. Phys. 17,132(1905).
[3]C. W. Berglund and W. E. Spicer, Phys. Rev. 136, A1030 & A1044(1964).
[4] 同步輻射光源簡介,行政院同步輻射研究中心。
[5] 同步輻射研究中心注射器簡介,賀璟源等 1993 P.774。
[6] 同步輻射研究中心注射器簡介,張正詳等 1993 P.776。
[7] 同步輻射研究中心注射器簡介,但唐諤等 1993 P.758。
[8] 同步輻射光源LSGM簡介,http://140.110.203.42/bldoc/08ALSGM.htm
[9] L.-C. Chou, C.-R. Wen and J. Chen CHINESE JOURNAL OF PHYSICS VOL. 38, NO. 5 OCTOBER 2000.
[10] C.-R. Wen and L.-C. Chou Journal of Chemical Physics Volume
112. Number 20 .22 May 2000.
[11]Y.Shimizu ,K.Ueda ,H.Chiba,M.Okunishi,K.Ohmori,Y.Sato,I.H.Suzuki,T.Ibuki,K.Okada ,Chem Phy 244 (1999) 439-448.
[12] K.J. Gruntz , L. Ley and R.L. Johnson , Phys. Rev. B24 (1981) 2069.
[13] Takuya Yonezawa , Hiroshi Daimon , Kan Nakatsuji , Kazuyuki Sakamoto , Shigemasa Suga , Hidetoshi Namba and Toshiaki Ohta , Jpn. J. Appl . Phys. Vol. 33 (1994) pp. 2248-2251 .
[14] J.K. Simons , S.P . Frigo , J.W. Taylor and R.A. Rosenberg .Surface Science 346 (1996) 21-30.
[15]M.N.Hedhili , M.Lachgar , Y.Le Coat ,R.Azria , M.Tronc , Q.B.Lu and T.E.Madey Journal of chemical physics volume 114,number 4 (2000)