Theoretical Investigation of Atomic Transition Amplitudes and the Intense-Field Effects

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Project title

Code/計畫編號

MOST104-2112-M019-003

Translated Name/計畫中文名

原子躍遷機率及強場效應研究

Project Coordinator/計畫主持人

Hsiang-Shun Chou

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Optoelectronics and Materials Technology

Website

https://www.grb.gov.tw/search/planDetail?id=11575407

Year

2015

Start date/計畫起

01-08-2015

Expected Completion/計畫迄

31-07-2016

Bugetid/研究經費

89千元

ResearchField/研究領域

物理

"我提出兩個原創性的新理論--相對論性多體微擾理論(H.S. Chou, Phys. Rev. A62, 42507 (2000))及飾態原子多光子光譜學(H.S. Chou and J. Evers, Phys. Rev. Lett. 104, 213602(2010))研究原子結構及光譜。長期目標為研究相對論、多體、及強場效應對原子性質的影響。 2014 年研究計畫包含三部份：一、類鎂離子能階及躍遷機率計算；二、建構具規範不變性的相對論性原子多體理論；三、EIA-EIT 轉換機制研究。在第一部分，我將利用相對論性多體微擾理論計算類鎂離子能階及躍遷機率。我曾用多組態相對論性混相近似理論計算類鎂離子躍遷機率，得到極佳的結果，論文刊登於J. Phys. B。我也曾利用相對論性多體微擾理論計算類鈹及類鋅離子躍遷機率，論文刊登於Phys. Rev. A 及J. Phys. B。我們相信相對論性多體微擾理論可得到比多組態相對論性混相近似理論更好的結果，為類鎂離子計算樹立里程碑。在傳統量子力學計算中，原子非共振躍遷的躍遷機率與電磁場的規範有關。在第二部分，我們將建構具規範不變性的相對論性原子多體理論。在第三部分，我將利用飾態原子多光子光譜學深入研究EIA-EIT 轉換機制。我已利用飾態原子多光子光譜學成功地解釋異常電磁誘發吸收(anomalous EIA)，論文刊登於Phys. Rev. Lett.。2012 年10 月，J. B. Kim 教授發現加一束激發雷射可使異常電磁誘發吸收轉換為電磁誘發透明(EIT)。其物理機制仍懸而未解。我將深入探討其物理機制並構思其他的 EIA-EIT 轉換方法。本計畫利用本人原創理論研究原子物理前沿課題。若蒙貴會贊助，定能有豐碩成果。" "I have proposed two theoretical methods--- relativistic many-body perturbation theory (RMBPT) (H.S. Chou, Phys. Rev. A62, 42507 (2000)) and dressed-atom multiphoton spectroscopy (DAMS) (H.S. Chou and J. Evers, Phys. Rev. Lett. 104, 213602(2010)) to study the structure and spectra of the atomic systems. The long-term aim is to investigate the effects of the relativity、 many-body、and intense field in atoms. This project contains three parts. In the first part, I will use the RMBPT to calculate the energies and the transition rates of the Mg-like ions. Many-body and relativistic effects play important roles in the Mg-like ions. I have used the multiconfiguration relativistic random-phase approximation to calculate the energies and the transition rates of the Mg-like ions. The results have been published in J. Phys. B. I have also performed the RMBPT calculations to determine the transition rates of the Be-like and the Zn-like ions. The results have been published in Phys. Rev. A. and J. Phys. B. The RMBPT will provide precise values for the transition rates in the Mg-like ions. In the conventional formulation, the transition amplitudes are gauge-dependent for the nonresonant transitions. In the second part, we obtain the amplitudes of multipole transitions from the gauge-invariant formulation. In the third part, I will use the DAMS to study the mechanism of the EIA-EIT transformation. The DAMS, with a careful account for the nonlinear response and the quantum interference, provides a powerful tool for studying the dynamics of the driven degenerate atomic systems. Recently, I applied the DAMS to provide a clear interpretation for the anomalous EIA. In October of 2012, J. B. Kim found that the anomalous EIA can be transformed to EIT by adding a pump field. The theoretical interpretation has not been given as yet. I will employ the DAMS to unveil the underlying mechanism for the EIA-EIT transformation. In this project, I will use the original theories developed by myself to study the frontier of atomic physics. With proper support, this project is viable and will lead to substantial results."

Keyword(s)

相對論性多體微擾理論
飾態原子多光子光譜學
規範不變性
relativistic many-body perturbation theory
dressed-atom multiphoton

DSpace CRIS

Theoretical Investigation of Atomic Transition Amplitudes and the Intense-Field Effects

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