在Pt(111)表面上研究雷射輔助光電效應; Study of laser-assisted photoelectric effect on Pt(111) surface.

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/43873

Title:	在Pt(111)表面上研究雷射輔助光電效應;Study of laser-assisted photoelectric effect on Pt(111) surface.
Authors:	歐瀝元;Lih-yuarn Ou
Contributors:	物理研究所
Keywords:	光電效應;雷射;雷射輔助;photoemission;laser;laser-assisted photoelectric effect
Date:	2010-07-28
Issue Date:	2010-12-08 14:23:54 (UTC+8)
Publisher:	國立中央大學
Abstract:	利用高強度雷射脈衝入射氣體靶材產生的高階諧波是一種極紫外光源與x光源，其擁有著短脈衝時寬、高時空同調性與低發散角的特徵。這樣的光源讓我們有機會利用此高階諧波探測原子分子與材料，到目前為止高階諧波經常應用於雷射輔助光電效應的實驗上，且發展了一段時間，對於化學表面的鍵結，與時間尺度上的探測，原子核內的反應都有所發現與發展。本論文將介紹中央大學強場物理與超快技術實驗室的短脈衝雷射系統，以及高階諧波與原子分子物理組的實驗站，與雷射輔助光電效應應用站的硬體架設與設計、雷射輔助光電效應的原理與應用、實驗的方法與步驟、分析與處理數據的方法與程式以及最後的結果與討論。我們利用改變遠紅外線短脈衝的強度發現多光子游離的光電子數量變多，且能量也較大。並且觀察到高階諧波於不同的入射角轟擊Pt(111)會造成不同動能的光電子，在雷射輔助光電效應下也有看到些許的變化。 High-order harmonics generated from laser-irradiated gas target is a coherent light source ranging from extreme ultraviolet to soft x-ray, with very short pulse duration, high spatiotemporal coherence, and low beam divergence. It can be used in the study of chemical reactions, molecular dynamics, surface catalysis, and transient electronic structures of condensed matters. It has been demonstrated that high-order harmonics can be applied to the experiment of laser-assisted photoelectric effect on metallic surface. In the thesis, the principle of the laser-assisted photoelectric effect is firstly introduced. Then the experimental setup of high-order harmonic generation and laser-assisted photoelectric effect on Pt(111) surface are presented, together with the analysis and discussion of the results. The angular distribution of the photoelectron energy spectrum and the modification of the spectrum resulted from laser-assisted photoelectric effect are observed.
Appears in Collections:	[Graduate Institute of Physics] Electronic Thesis & Dissertation

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