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研究生： 鄭瑋凌
Wei-Ling Cheng
論文名稱： 使用飛秒光頻梳量測鉈原子在6P1/2→7S1/2躍遷的絕對頻率
Absolute Frequency Measurement of Thallium 6P1/2→7S1/2 Transitions Using Optical Femtosecond Comb
指導教授： 劉怡維
Yi-Wei Liu
口試委員:
學位類別： 碩士
Master
系所名稱： 理學院 - 物理學系
Department of Physics
論文出版年： 2005
畢業學年度： 94
語文別： 英文
論文頁數： 34
中文關鍵詞： 鉈 、光頻梳 、絕對頻率
外文關鍵詞： Thallium, Optical Femtosecond Comb, Absolute Frequency
相關次數： 點閱：4  下載：0 
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    • 鉈原子在『宇稱不守恆（ parity non-conservation ） 』、『電子電偶極矩（ electron’s electrical dipole moment ）』的測量及理論上扮演重要的角色。其理論計算需要清楚知道該原子的波函數（ wave function ），需要其他原子結構的實驗測量加以驗證理論和其精確度或者建立更好的模型，原子躍遷頻率的測量就是其中之一。
    本實驗用雷射激發輻射（ laser induced fluorescence ）的方法觀察鉈原子6P1/2→7S1/2躍遷。利用原子束測量光譜以減少都卜勒線寬，使用相對的兩道雷射光做飽和吸收光譜，藉由飛秒光頻梳（ optical femtosecond comb ）測量飽和吸收光譜中心譜線（Lamb dip）以達絕對頻率之測量。本實驗絕對頻率的精確度到 0.4 MHz，使得7S1/2的超精細結構常數（ hyperfine constant ）的精確度改進了兩倍。最後分析鉈原子的『超精細結構反常（ hyperfine Anomalies ）』，結果可以應用於解釋電子電偶極矩測量的 Schiff moments 模型上，以進一步了解物理基本對稱性（ fundamental symmetry ）。

    The Doppler-free spectroscopy of atomic thallium 6P1/2 ! 7S1/2 transitions have been observed by centering the Lamb dip using two counter-propagating laser beams perpendicular to the atomic beam, and the absolute frequencies of these transitions have been measured to an accuracy of 0.4 MHz (1 ppb) using the optical femtosecond comb. The hyperfine splittings and isotope shifts are derived from our results, which are in agree with the previous experimental results, and improved by a factor of 2–3.

    1 Introduction 1 1.1 Motivation 1.2 Energy Level of Thallium and Laser Induced Fluorescence 1.3 Optical Femtosecond Comb System 2 Experiment 6 2.1 Experiment Setup 2.1.1 Laser Source 2.1.2 Oven and Atomic Beam 2.1.3 Optical Femtosecond Comb System 2.2 Data Acquisition and Histogram 3 Data and Analysis 3.1 Systematic Effect 3.1.1 Saturation and Power Broadening 3.2 Results and Discussion 3.2.1 HFS, IS and the Mean Square Isotopic Change λc,m 4 Conclusions A ROOT Program for Data Fitting B Setup of Optical Frequency Comb

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