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Alkali Metal Rydberg Atoms in Strong External Fields

Author: SongHongWei
Tutor: LiYong
School: Central China Normal University
Course: Optics
Keywords: Rydberg states of alkali metal atoms Model potential Floquet method . Multiphoton transition Microwave threshold spectrum B-spline Radial matrix elements Anti-cross
CLC: O562.3
Type: Master's thesis
Year: 2009
Downloads: 23
Quote: 0
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Abstract


Highly excited atoms ( Rydberg atoms) knowledge and understanding of atomic dynamics very effective tool . Therefore, the transition from the Rydberg states of alkali metal atoms through the transition of the Rydberg states of alkali metal atoms and ionization behavior can look for the possibility of using classical chaos theory to explain the experimental results and to find classical chaos quantum performance the study of the behavior of atomic and molecular physics and astrophysics extremely active area of ??research ; same time, the atom-field interaction studies help us to understand the structure of the atom depends on the interaction of the spin and angular momentum coupling mechanism . The main work of this paper is to study the highly excited states of alkali metal atoms strong external electric field , the main contents are as follows : (1) based on an atomic potential model , the use of the Floquet method to calculate the Rydberg states of potassium atoms in the microwave field multi-photon transition probabilities are given for the first time able to directly compare the theory with the experimental results microwave threshold spectrum , threshold field and the position of the resonance field of the theory are in good agreement with the experimental results . The calculation results confirmed the position of the threshold field does not exist a smooth dependence of n ; in normal circumstances, before it reaches the threshold field , microwave threshold spectrum does not appear resonant structure . (2) to overcome the traditional Coulomb 's method of calculation of highly excited state atoms difficulties radial matrix elements , explore a new method to calculate the radial matrix elements of alkali metal atoms in Rydberg states . Based on B-spline expansion technique and model potential , calculated by double-precision numerical integration , highly excited states of atoms radial matrix elements , the principal quantum number n to 145 , and maintained for at least five significant digits , Coulomb only able to calculate the principal quantum number n < 30 the radial matrix elements . As a test example , the highly excited states of sodium atoms in the electrostatic field position and width of the principal quantum number n of 70 energy levels of the initial anti - cross . According to the view of the alkali metal atom the microwave ionization multi-step transition , the ionization probability is determined by the first step transition , our method can be used directly for the quantitative study of multi-photon ionization process .

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CLC: > Mathematical sciences and chemical > Physics > Molecular physics, atomic physics > Atomic Physics > Atomic Spectroscopy
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