鹵化亞甲基分子之可見光區電子光譜研究; Visible Wavelength Electronic Spectroscopy of Halomethylenes

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/5922

Title:	鹵化亞甲基分子之可見光區電子光譜研究;Visible Wavelength Electronic Spectroscopy of Halomethylenes
Authors:	李佳玲;Chia-Ling Lee
Contributors:	化學研究所
Keywords:	光譜;雷射;亞甲基;Laser;methylene;Spectroscopy
Date:	2003-06-24
Issue Date:	2009-09-22 10:10:26 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	鹵化亞甲基分子在大氣、材料、有機化學中為非常重要的反應中間物，其存在時間短不容易偵測並且受到Renner-Teller effect、費米共振(Fermi resonances)及電子軌域偶合(spin-orbit coupling)等作用力的影響使其光譜顯的非常複雜。本實驗利用超音速自由噴射分子束裝置搭配高壓直流放電技術來產生鹵化亞甲基分子DCCl、HCBr及CBr2並得到其雷射誘導螢光激發光譜及螢光分光光譜。在DCCl實驗中，首次成功取得波長為570 nm至620 nm的DCCl之雷射誘導螢光激發光譜及螢光分光光譜，並由分析光譜完整得到基態的振動頻率、振動常數以及三重態與單重態能差約為11kcal/mol。在HCBr實驗中，首次成功取得波長為645 nm至660 nm的HCBr雷射誘導螢光激發光譜，得其電子激發態的轉動常數及鍵長。並且第一次發現 27能階而由激發 27能階的螢光分光光譜，首次得到C-H拉伸振動頻率為2092cm-1。在CBr2 實驗中，成功取得546 nm至576 nm的雷射誘導螢光激發光譜，第一次發現譜帶，並測得其螢光生命期平均值為3.4 。 Since there exist the Renner-Teller effects, spin-orbit couplings, and Fermi resonances as well as interplays between these interactions in the electronic spectra of simple methylenes, the spectroscopy of these species such as HCBr, DCCl, CBr2 were found to be very complicated. We have sucessfully acquaired the laser-induced fluorescence(LIF) spectra and dispersed fluorescence(DF) spectra of these species. The dispersed spectra reveal the ground state vibrational structure of these molecules and the perturbations from the background triplet state.
Appears in Collections:	[Graduate Institute of Chemistry] Electronic Thesis & Dissertation

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