研究目的
To investigate the attosecond ionization dynamics of atoms, focusing on the role of the initial state and the effects of elliptically polarized attosecond laser pulses on photoelectron momentum distributions (PMDs).
研究成果
The study reveals that photoelectron momentum distributions (PMDs) are sensitive to the parameters of laser pulses and the magnetic quantum number of the initial state. This sensitivity allows for the characterization of pulses and monitoring of the rotation direction of ionized orbitals during ultrafast photoionization processes. The findings are consistent with the first-order time-dependent perturbation theory (TDPT), providing a new tool for detecting the rotation direction of ring currents.
研究不足
The study is limited to numerical simulations and theoretical analysis, without experimental validation. The focus is on neon atom and its model atom, which may not fully represent the behavior of other atoms or molecules under similar conditions.
1：Experimental Design and Method Selection:
The study involves numerical simulations of the neon atom and its model atom under a pair of elliptically polarized attosecond laser pulses by solving the two-dimensional time-dependent Schr?dinger equations (TDSE).
2：Sample Selection and Data Sources:
The simulations are conducted on neon atom and its model atom with different initial states.
3：List of Experimental Equipment and Materials:
The study utilizes numerical methods and the LZH-DICP code for simulations.
4：Experimental Procedures and Operational Workflow:
The TDSE is propagated on a 2D Cartesian grid using the parallel quantum wave-packet computer code LZH-DICP. The wave function is further propagated for an additional ten optical cycles after the end of the laser pulse to ensure all the ionized components move away from the core.
5：Data Analysis Methods:
The final photoelectron momentum distribution (PMD) is obtained by Fourier transforming the ionized wave function. The first-order time-dependent perturbation theory (TDPT) is employed to analytically analyze the interaction between the XUV pulse and the atom.
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