鋰原子D譜線的量測｜國立清華大學博碩士論文庫

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研究生：	曾安廷 Tseng, An-Ting
論文名稱：	鋰原子D譜線的量測 Spectroscopy of lithium D lines
指導教授：	王立邦 Wang, Li-Bang
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：	2010
畢業學年度：	98
語文別：	英文
論文頁數：	39
中文關鍵詞：	鋰、D譜線
外文關鍵詞：	lituium, D line, cross-beam method
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We aim to measure the lithium D lines to test many-body QED calculations of few-electron system. The former experimental data from different groups are not consistent and there are also discrepancies in theoretical calculation. Therefore, more experimental confirmation is strongly desired. The lithium D lines were studied using an external cavity diode laser system that was frequency stabilized by a Fabry-Perot interferometer. The individual hyperfine transitions of the D1 line are well resolved using cross-beam method to eliminate Doppler broadening. The results for the 2S1/2 and 2P1/2 hyperfine structure interval are 800.788 ± 0.632 and 93.967 ± 0.259 MHz respectively. It is not consistent with previous measurements [1][3] due to lack of precise frequency determination of our laser system. Future work and possible improvement are discussed.

我們藉由測量鋰原子的D 譜線來驗證少原子系統的多體QED 計算。由於之前其他實驗小組的實驗數據並不一致，而且理論計算也和實驗結果分歧，因此需要更多的實驗結果來確認。我們使用由Fabry-Perot 干涉共振腔穩頻的外腔二極體雷射系統來進行鋰原子的D譜線測量。我們使用垂直原子束的方法來移除都普勒頻寬並解析了D1譜線的超精細結構。實驗結果如下：2S1/2 到 2P1/2 的超精細結構分裂間距為 800.788 □ 0.632 MHz 以及 93.967 □ 0.259 MHz。這和前人測量的結果 [1][3]並不吻合。原因在於我們並沒有精準的雷射頻率控制。本論文也討論了未來工作以及可能的改進措施。

   Introduction    1
1 History of the D line    1
2 Motivation    2
   Theory    4
1 Fundamental Physical Properties    4
2 Optical Properties    8
3 Atomic theory calculations    10
3.1 The central-field approximation    10
3.2 Fine structure    12
3.3 Hyperfine structure    13
4 The crossed-beam method    15
   Experiment    16
1 Laser system    16
2 Atomic beam    19
3 Frequency stabilization    20
4 Fluorescence detection    22
5 Optical layout    23
   Results and discussion    25
1 systematic errors    25
1.1 Zeeman effect    25
1.2 Effect of misalignment    26
2 Results and discussion    28
3 Consistency checks and comparison to previous results    33
   Conclusion    37
   Bibliography    38

                                

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