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photodetachment dynamics of H^- ion in a harmonic potential plus a time-dependent oscillating electric field

Chinese Physics B 2017年第10期26卷 181-188页

作者：王德华王传娟 School of Physics and Optoelectronic Engineering Ludong University Linqu Vocational Education Center School

The photodetachment dynamics of H^- ion in a harmonic potential plus an oscillating electric field is studied using the time-dependent closed orbit theory. An analytical formula for calculating the photodetachment cross section of this system is put forward. It is found that the photodetachment cross section of this system is nearly unaffected for the weak oscillating electric field strength, but oscillates complicatedly when the oscillating electric field strength turns strong. In addition, the frequency of the harmonic potential and the oscillating electric field （the frequency of the harmonic potential and the frequency of the oscillating electric field are the same in the paper, unless otherwise stated.） can also affect the photodetachment dynamics of this system. With the increase of the frequency in the harmonic potential and the oscillating electric field, the number of the closed orbits for the detached electrons increased, which makes the oscillatory structure in the photodetachment cross section much more complex. Our study presents an intuitive understanding of the photodetachment dynamics driven by a harmonic potential plus an oscillating electric field from a space and time dependent viewpoint. This study is very useful in guiding the future experimental research for the photodetachment dynamics in the electric field both changing with space and time.

关键词： harmonic potential oscillating electric field time-dependent closed orbit theory photodetachment dynamics

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photodetachment dynamics of H- ion in a harmonic potential plus a time-dependent oscillating electric field

Photodetachment dynamics of H- ion in a harmonic potential p...

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2017年第九届全国青年计算物理学术会议

作者：王德华徐钦峰孔令斌 School of Physics and Optoelectronic Engineering Ludong University

The photodetachment dynamics of Hion in a harmonic potential plus an oscillating electric field has been studied using the time-dependent closed orbit *** analytical formula for calculating the photodetachment cross section of this system has been put *** is found that thephotodetachment cross section of this system is nearly unaffected for the weak oscillating electric field strength,but oscillates complicatedly when the oscillating electric field strength gets *** addition,the frequency of the harmonic potential and the oscillating electric field can also affect the photodetachment dynamics of this *** the increase of the frequency in the harmonic potential and the oscillating electric field,the number of the closed orbit for the detached electron is increased,which makes the oscillatory structure in the photodetachment cross section become much more *** research provides an intuitive understanding for the photodetachment dynamics driven by a harmonic potential plus an oscillating electric field from a space and time dependent *** study is very useful in guiding the future experimental research for the photodetachment dynamics in the electric field both changing with space and time.

关键词： harmonic potential oscillating electric field time-dependent closed orbit theory photodetachment dynamics

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Temporal interference driven by an oscillating electric field in photodetachment of H^- ion

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Chinese Physics B 2018年第2期27卷 314-320页

作者：王德华李梦芝宋鸿娜任笑笑 School of Physics and Optoelectronic Engineering Ludong University

The real time domain interferometry for the photodetachment dynamics driven by the oscillating electric field has been studied for the first time. Both the geometry of the detached electron trajectories and the electron probability density are shown to be different from those in the photodetachment dynamics in a static electric field. The influence of the oscillating electric field on the detached electron leads to a surprisingly intricate shape of the electron waves, and multiple interfering trajectories generate complex interference patterns in the electron probability density. Using the semiclassical open-orbit theory, we calculate the interference patterns in the time-dependent electron probability density for different electric field strengths, different frequencies and phases in the oscillating electric field. This method is universal, and can be extended to study the photoionization dynamics of the atoms in the time-dependent electric field. Our study can guide the future experimental researches in the photodetachment or photoionization microscopy of negative ions and atoms in the oscillating electric field.

关键词： temporal interference photodetachment dynamics oscillating electric field semiclassical open-orbit theory

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Effect of Environment on Photo-detachment dynamics of Halide Ions： A Model Approach

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Chinese Journal of Chemical Physics 2010年第1期23卷 30-38,I0001页

作者： Bikram Nath Chandan Kumar Mondal 萨哈核物理研究所晶体学和分了生物学司加尔各答700064 贾德普大学物理化学部化学系加尔各答700032

A two dimensional model approach for the photodetachment dynamics of closed shell an-ionic systems in presence of external light field have been proposed in the context of polar environmental media. The effects of strong coupling between the solvent polarization and the extra charge in the system were studied by a simple model. The electronic states of con-cerned halide ions are represented by a two dimensional model Hamiltonian with a potential V（x,y）=-V0e^-σ（x^2＋y^2）. The time dependent Fourier grid Hamiltonian method have been used to follow the detachment process with fairly high intensities of light. The environmental effects on the dynamics are sought to be modeled by two different ways. The first one was the presence of polar solvents which perturb the energy levels of anionic systems by changing the effective potential surface and the second one was allowing the fluctuation of the well depth randomly to mimic the system in a more realistic view point. The average detachment rate constant is calculated as a function of important parameters of the used light field to explain the effects of solvent field on the dynamical behavior of dipole bound anionic system at least in a qualitative way.

关键词： photodetachment dynamics Environmental effect Time-dependent Fourier grid Hamiltonian Stochastic deactivation

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