二溴一氯甲烷在近紫外光區多光子光解機構之新研究; Multiphoton photodissociation mechanisms of dibromochloromethane at near ultraviolet wavelengths.

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题名:	二溴一氯甲烷在近紫外光區多光子光解機構之新研究;Multiphoton photodissociation mechanisms of dibromochloromethane at near ultraviolet wavelengths.
作者:	楊士興;Shi-Xing Yang
贡献者:	化學研究所
关键词:	二溴一氯甲烷;雷射;多光子光解機構;dibromochloromethane;Multiphoton photodissociation mechanisms
日期:	2009-06-25
上传时间:	2009-09-22 10:20:51 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	本研究是以 266 nm、280 nm、285 nm、289 nm、355 nm雷射為光解光源，於流動式樣品槽中進行二溴一氯甲烷 (CHBr2Cl) 的光解反應，搭配染料雷射探測其中間產物的雷射誘導螢光分光光譜，並取得各物種的放射光譜。由於先前研究的結果和在其他溴烷類(CHBr3和CHBrCl2) 之研究結果有所不一致，重新以266 nm光解二溴一氯甲烷 (CHBr2Cl) 所得之放射光譜中，可以觀測的物種為 CH (A2Δ,B2Σ-, C2Σ+)，激發態溴原子的躍遷 C2 的 Swan Band。在雷射誘導螢光分光光譜中可以觀測到激發態的 CHCl。利用觀測到物種所做不同功率之雷射光源對訊號放光強度的實驗、改變樣品槽壓力觀測訊號強弱的實驗以及利用不同近紫外光波長光解二溴一氯甲烷之放射光譜的不同，可以更進一步了解二溴一氯甲烷在近紫外光區的光解機制。 The photolysis at near ultraviolet wavelengths of halomethanes such as dibromochloromethane (CHBr2Cl) is an importance source of bromine atoms that contributes to the stratospheric ozone depletion, but the multiphoton photodissociation mechanisms of CHBr2Cl still remain unclear. Previous study at 266 nm has some results that are inconsistent with the mechanism model for other bromomethanes (CHBr3 and CHBrCl2). In this thesis, we investigated the multiphoton photolysis of CHBr2Cl at 266 nm as well as at other wavelengths (280 nm, 285 nm, 289 nm, and 355 nm). Nascent emission spectra and laser-induced dispersed fluorescence spectra of products or reaction intermediates in these photolysis reactions of CHBr2Cl in a slow flow cell were successfully recorded. Several electronically excited species including CH (A2Δ, B2Σ–, and C2Σ+), C2 (d3Πg), and excited state atomic Br were observed in the nascent emission spectra, while CHCl was successfully found using the laser-induced dispersed fluorescence spectroscopy. More experiments including the concentration dependence and the power dependence were also conducted and these results clarified the multiphoton photolysis mechanism of CHBr2Cl at near ultraviolet wavelengths.
显示于类别:	[化學研究所] 博碩士論文

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