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姓名 謝智明(Jhi-Ming Sheh)  查詢紙本館藏   畢業系所 物理學系
論文名稱 16K下H2O+CO2+NH3混合冰晶的光脫附反應之傅氏紅外光譜
(FTIR spectra of EUV Photo-desorbed H2O+CO2+NH3 Mixed Ice System at)
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摘要(中) 我們使用傅氏紅外光譜儀測量混合冰晶,水,二氧化碳,氨在超高真空,低溫16K下使用在新竹同步輻射中心的真空紫外光之光譜,其生成物含有XCN, CO, CH3OH, C2H6, CH3, H2CO, H2CO3, and possibly HCOOH, CH4 及 CO3 等等,但未含乙醇及丙烷。
摘要(英) Abstract
Experimental results on the spectral identification of new infrared absorption features and the changes of their absorbances produced through vacuum ultraviolet-extreme ultraviolet(VUV-EUV) photon-induced chemical reactions in the H2O-NH3-CO2 mixed ices at 16K are obtained. The compositions, i.e., H2O:NH3:CO2= 6:1:1 were chosen in this work. Zeroth order white light from the SEYA beamline at Synchrotron Radiation Research Center (SRRC) in Hsinchu was used to provide required VUV-EUV photons. A FTIR spectrometer was employed to obtain the in-situ IR spectra produced through VUV or EVU photolysis of a given ice sample. Ultraviolet photolysis of these ices produces a variety of photoproducts including XCN, CO, CH3OH, C2H6, CH3, H2CO, H2CO3, and possibly HCOOH, CH4 and CO3. However, despite of so many photoproducts were produced by the feeding of strong white light photon energies C2H5OH and C3H8 were still not been found in these experiments.
關鍵字(中) ★ 傅氏紅外光譜儀
★ 冷凍機
★ 水
★ 二氧化碳
★ 甲烷
★ 乙烷
★ 甲醛
關鍵字(英) ★  C2H6
★ CH4
★ H2CO3
★ H2CO
★ XCN
★ NH3
★ CO2
★ H2O
★ cryostat
★ mixed ice
★ FTIR
論文目次 Abstract……………………………………………………………………..Ⅱ
Contents………………….……..…………………………..………………….Ⅲ
Figures List…………………….……………………………………………..Ⅳ
Tables List…………………………………………………………………….Ⅴ
Chapter Ⅰ Introduction…………………………………………..1
Chapter Ⅱ Experimental Set-up and Procedures…………………………3
Chapter Ⅲ Results & Discussion…………………………………………5
Chapter Ⅳ Conclusion……………………………………………………10
References…………………………………..………………………...…………11
Appendix A: Photon Flux & Quantum Efficiency……………………………28
Appendix B: Column Density & Energy Dose………………………………..29
Appendix C: Summary of the IR spectral positions and their band strengths for the relevant icy molecules………………………………….30
Figures Lists
Fig. 1 A schematic diagram of the preparation system………….……..…………14
Fig. 2 A schematic diagram of the ultra-high vacuum chamber………………….15
Fig. 3 The photo of the experiment arrangement…………………………………16
Fig. 4-1 The IR absorbance of the mixed ice sample before photolysis……………..17
Fig. 4-2The IR absorbance of the mixed ice sample that the difference of absorbances ( continuous to next two pages ) of H2O + CO2 + NH3 ( 6:1:1 ) ices taken after the white light irradiation. We have found new products such as CH3OH, C2H6, CO3, H2CO, H2CO3, CH3, HCOOH…………………….……………18
Fig. 4-3 The IR absorbance of the mixed ice sample that the difference of absorbances (continuous to next pages ) of H2O + CO2 + NH3 ( 6:1:1 ) ices taken after the white light irradiation. We have found new products such as CH3OH, C2H6, CO3, H2CO, H2CO3, CH3, HCOOH……………………………………...…19
Fig. 4-4 The IR absorbance of the mixed ice sample that the difference of absorbances of H2O + CO2 + NH3 ( 6:1:1 ) ices taken after the white light irradiation. We have found new products such as CH3OH, C2H6, CO3, H2CO, H2CO3, CH3, HCOOH……………………………………………………………….……20
Fig. 5 The IR absorbance of the mixed ice sample before photolysis ( the left top panel ) and the difference of absorbances of evolution of H2O + CO2 + NH3 ( 6:1:1 ) ices taken after the white light irradiation. We have found new products such as XCN, CO…………………………………………………21
Fig. 6-1 Plot of results for R.G.A. with mass=1, 2, 15, 16, 17, 18, 19, 28, 29, 30, 32, 40, 44, 45 amu…………………………………………………………...…22
Fig. 6-2 Plot of results for R.G.A. with mass=41, 100 amu……………..………..…23
Fig. 7-1 Plot of results for the H2CO3 and CO product column densities as a function of the total incident photon energy in units of eV/cm2……………...……...24
Fig. 7-2Plot of results for the H2CO and CH3OH product column densities as a function of the total incident photon energy in units of eV/cm2……..…,.....25
Fig. 7-3 Plot of results for the C2H4, C2H6 and XCN product column densities as a function of the total incident photon energy in units of eV/cm2……….…...26
Fig. 8 The plot of Ni mesh quantum efficinecy for Seya beamline at SRRC……...28
Fig. 9 The plot of Photon Flux for Seya beamline at SRRC……………………….28
Tables List
Table 1 The results of H2CO3, H2CO, CO, CH3OH, C2H4, C2H6 and XCN that column density vs. energy dose…………………………………………………...…27
Table 2 Summary of the IR spectral positions and their band strengths for the relevant icy molecules………………………………………………………………..30
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Wu C. Y. R., D. L. Judge and B. M. Cheng, 2002b, EUV Photolysis of CH4 +H2O Mixed Ice Systems at 10K, Bull. Am. Astron. Soc., 34, No. 3, pp. 908.
Bernstein M. P., S. A. Sandford and L. J. Allamandola, 2000, H, C, N, and O Isotopic Substitution Studies of the 2165 Wavenumber (4.62 Micron) “XCN” Feature Produced by Ultraviolet Photolysis of Mixed Molecular Ices, APJ., 542, pp. 894-897.
Bernstein, M., S. A. Sandford, and L. J. Allamandola, 1999, Life’s Far-Flung Raw Materials, Scientific American, p. 26, the July issue.
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D’Hendecourt, L. B., L. J. Allamandola, 1986, Time-Dependent Chemistry in Dense Molecular Clouds, III. Infrared Band Cross Section of Molecules in the Solid State at 10 K, Astron. Astrophys. Suppl. Ser., 64, 453-467.
Ehrenfreund P. and S. B. Charnley, 2000, Organic Molecules in the Interstellar Medium, Comets, and Meteorites: A Voyage from Dark Clouds to the Early Earth, Annu. Rev. Astron. Astrophys. VOL. 38, pp.427-483.
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指導教授 易台生(Tai-Sone Yih) 審核日期 2003-1-16
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