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  1. NTU Theses and Dissertations Repository
  2. 理學院
  3. 物理學系
Please use this identifier to cite or link to this item: http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/45781
Title: 強場雷射中原子的超閾值電離譜:近核區域波包的第一原理計算
Above-Threshold Ionization Spectra of Rare Gases
Atoms in Intense Laser Pulses: the Ab-initio Approach from Core Region of Wave Packet
Authors: Jhih-An You
游至安
Advisor: 朱時宜(Shih-I Chu)
Keyword: 多光子游離,閾值電離,密度泛函理論,擬譜方法,載波包相位,
multiphoton ionization,above-threshold Ionization,density functional theory,pseudospectral spectral method,carrier-envelope phase,
Publication Year : 2010
Degree: 碩士
Abstract: 本文提出了新的數值方法,用無自我交互作用的時變孔恩-沈方程
式來處理非微擾的多光子游離、超閾值電離。因為在此我們不需要處
理離核很遠處的波函數的時間演化,所以這個方法不但精確也很省
時。這方法是建立在將波函數從實驗室座標轉換到
Kramers-Henneberger 框架上,我們把這方法應用到惰性氣體的超閾值
電離。在此我們計算電子的能譜跟其角度分布,結果顯示了電子頻譜
與雷射強度、頻率、載波包相位的相依性,並跟實驗作比較。
We present a new method for the the numerical solution of the self-interaction-free
time-dependent Kohn-Sham equation for the nonperturbative treatment of multiphoton
ionization (MPI), above-threshold ionization (ATI), and electron energy and angular
distribution after ATI. The method is accurate and efficient because we don’t need to
perform the propagation of the time-dependent wave function to the large distance.
The procedure is based on the extension of the Kramers-Henneberger picture of the
ionization process while the initial expressions involve the wave function in the laboratory
frame only. This approach is applied to the accurate study of ATI processes of the
rare gas atoms subject to intense laser pulse. We calculate and discuss ejected electron
energy and angular distributions. The results reveal the electron spectrum dependence
on the duration of the laser pulse and the carrier-envelope phase.
URI: http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/45781
Fulltext Rights: 有償授權
Appears in Collections:物理學系

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