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Student Number 982203020
Author Sin-hua Yang(楊欣樺)
Author's Email Address No Public.
Statistics This thesis had been viewed 310 times. Download 11 times.
Department Chemistry
Year 2010
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Visible Wavelength Emission Spectroscopy Following the 266 nm Photolysis of Iodomethanes
Date of Defense 2011-06-21
Page Count 81
Keyword
  • iodomethanes
  • nascent emission spectrum
  • photolysis
  • Abstract 266 nm laser photolysis of CH2I2 and CH3I were conducted in a slow flow cell. Previous results show that this photolysis produces several unknown bands in the nascent emission spectrum at visible wavelengths. In this study, a high sensitivity intensified charge-couple device (ICCD) detector was employed for recording better nascent emission spectra from near-infrared to visible wavelengths with the improvement on signal-to-noise ratios of at least a factor of 3. Frequencies, bandwidths, and waveforms of these unknown bands provide the data basis for analysis. Emission spectra under different pressures and those at different delay times were also acquired. These results indicate that the unknown bands are a series of emission bands that originate from the same upper level to different lower levels. The ground state vibrational parameters are determined to be: ω1= 434.9±0.6 cm-1 and ω2= 220±3 cm-1. The possible carrier molecule of these unknown bands could be therefore identified.
    Table of Content 目錄
    摘要 (中文)                       I
    摘要 (英文)                       II
    目錄                          III
    表目錄                         V
    圖目錄                         VI
    第一章 緒論                   
    1-1 研究方向與動機                    1
    1-2 碘化甲烷類分子對環境之影響              3
    1-3 光解碘化甲烷類分子之研究               5
    1-4 研究目標                       9
    第二章 實驗                 
    2-1 光譜技術簡介                     10
    2-2 流動式樣品槽之實驗裝置                11
    2-3 偵測器                        13
    2-4 光譜之放光收集                    16
    2-5 不同時間點上與訊號強度的關係 (time dependence)    18
    2-6 不同功率之雷射光源對訊號強度的關係 (power dependence)19
    第三章 結果與討論
    3-1 未知譜帶之初始放射光譜                20
    3-2 未知譜帶之初始放射光譜結構分析            21
    3-3 未知譜帶在時間軸上之訊號強度變化           22
    3-4 未知譜帶在不同壓力下之相對強度變化          25
    3-5 未知譜帶之振動頻率                  25
    3-6 未知譜帶之可能物種                  28
    3-7 同位素取代法                     32
    3-8 未知譜帶之產生機制                  33
    第四章 結論                       36
    參考文獻                         67
    表目錄
    表一 單光儀之三種光柵                 38
    表二 光解二碘甲烷放射光譜之絕對頻率          39
    表三 光解二碘甲烷放射光譜之相對頻率          41
    表四 未知譜帶之振動參數                43
    表五 CI2、CHI、HC2I、IC2H+、CCCl-、CCBr-之振動參數 44
    表六 各物種的生成焓                  46
    圖目錄
    圖一 流動式樣品槽266 nm光解二碘甲烷之放射光譜     47
    圖二 光解二碘甲烷產生未知譜帶之放射光譜        48
    圖三 流動式樣品槽實景                 49
    圖四 初始放射光譜實驗裝置               50
    圖五 流動式樣品槽光解二碘甲烷之放射光譜        51
    圖六 流動式樣品槽光解二碘甲烷之放射光譜        52
    圖七 流動式樣品槽光解二碘甲烷與碘甲烷之放射光譜    53
    圖八 流動式樣品槽光解二碘甲烷之放射光譜        54
    圖九 將二碘甲烷之未知譜帶分成兩組振動模式       55
    圖十 光解二碘甲烷產生未知譜帶放光之訊號與時間關係圖  56
    圖十一 光解碘甲烷產生未知譜帶放光之訊號與時間關係圖   57
    圖十二 光解二碘甲烷產生C2放光之訊號與時間關係圖     58
    圖十三 不同壓力下光解二碘甲烷產生未知譜帶放光之訊號
        與時間關係圖                  59
    圖十四 不同延遲時間下偵測二碘甲烷之未知譜帶       60
    圖十五 不同壓力下偵測二碘甲烷之未知譜帶         61
    圖十六 流動式樣品槽光解二碘甲烷之放射光譜        62
    圖十七 流動式樣品槽光解二碘甲烷之放射光譜        63
    圖十八 流動式樣品槽光解二碘甲烷之放射光譜        64
    圖十九 流動式樣品槽內光解二碘甲烷-D與二碘甲烷      
        之放射光譜                    65
    圖二十 流動式樣品槽光解二碘甲烷-D與二碘甲烷       
        之未知譜帶放射光譜                66
    參考文獻             67
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    Advisor
  • Bor-Chen Chang(張伯琛)
  • Files
  • 982203020.pdf
  • disapprove authorization
    Date of Submission 2011-07-19

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