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Photoabsorption by atoms in external fields near the ionization threshold

E.B. Bogomol'nyi

World Scientific series in 20th century physicsAug 1, 19963 citations

Control Of Photoabsorption Products By Laser Fields Applied To The Ca Atom

Takashi Nakajima, Jian Zhang, P. Lambropoulos

Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)Aug 24, 20050 citations

Main Points of the Theory of Photoabsorption

M. Ya. Amusia, Larissa V. Chernysheva, V. G. Yarzhemsky

Springer eBooksJan 1, 20121 citation

Variation of photoabsorption cross section of atomic silver from isolated to condensed conditions

Xiao‐Guang Ma, Gong Yu-Bing, Qu Zhao-Jun

The influence of the local-field on the photoabsorption cross section of the atomic silver is studied in detail by using the Clausius–Mossotti (CM) model and the Onsager model separately. The variations of the photoabsorption cross section of atomic silver with number density and radius of the environmental interaction cavity are studied systematically by using more general expressions for the photoabsorption cross sections, proposed by Sun et al recently. It has proved to be reasonable to model the optical response properties of bulky material by coupling the property of isolated atom with the environmental effects in the present work.The influence of the local-field on the photoabsorption cross section of the atomic silver is studied in detail by using the Clausius–Mossotti (CM) model and the Onsager model separately. The variations of the photoabsorption cross section of atomic silver with number density and radius of the environmental interaction cavity are studied systematically by using more general expressions for the photoabsorption cross sections, proposed by Sun et al recently. It has proved to be reasonable to model the optical response properties of bulky material by coupling the property of isolated atom with the environmental effects in the present work.

Chinese Physics BMar 17, 20094 citations

Atomic photoabsorption process controlled by static and oscillating magnetic fields

Takeshi Shirahama, Xiao‐Min Tong, Ken-ichi Hino +1 more

We present a theoretical method to study atomic photoabsorption processes in a temporally periodic external field. The time development of the atomic dipole moment is propagated by numerical time propagation, and the photoabsorption cross sections is obtained directly from the Fourier transform of the autocorrelation function without summing up over the Floquet-Fourier components. As an example, we study the photoabsorption spectra of hydrogen atoms exposed in a mixture of static and periodically oscillating magnetic fields for the transition from $1s\ensuremath{\rightarrow}2p$. The atomic energy structure and photoabsorption spectra show interesting dependence on the strength of the oscillating magnetic field. Tuning the combination of the magnetic field strengths, we can control the photoabsorption process. The proposed method is general and can be applied to processes in which the number of relevant high harmonic components of the Fourier expansion is so large that the conventional Floquet method is intractable.We present a theoretical method to study atomic photoabsorption processes in a temporally periodic external field. The time development of the atomic dipole moment is propagated by numerical time propagation, and the photoabsorption cross sections is obtained directly from the Fourier transform of the autocorrelation function without summing up over the Floquet-Fourier components. As an example, we study the photoabsorption spectra of hydrogen atoms exposed in a mixture of static and periodically oscillating magnetic fields for the transition from $1s\ensuremath{\rightarrow}2p$. The atomic energy structure and photoabsorption spectra show interesting dependence on the strength of the oscillating magnetic field. Tuning the combination of the magnetic field strengths, we can control the photoabsorption process. The proposed method is general and can be applied to processes in which the number of relevant high harmonic components of the Fourier expansion is so large that the conventional Floquet method is intractable.

Physical Review AOct 23, 20096 citations

Density-dependent photoabsorption cross sections of atomic Xe

Xiao‐Guang Ma

The evolution of the photoabsorption cross sections of atomic xenon with number densities varying from ideal gas to condensed matter has been studied by an alternative view in the present work. The alternative expressions of the photoabsorption cross sections presented by Sun et al recently were used with the local field models that has proven to be generalized easily to multiatomic systems including molecules and condensed phase systems. The present results show that the variation of the photoabsorption cross sections of atomic xenon in the giant resonance region from the isolated to the condensed conditions is very small, which agrees well with the variation law of the solid and gas experiments.The evolution of the photoabsorption cross sections of atomic xenon with number densities varying from ideal gas to condensed matter has been studied by an alternative view in the present work. The alternative expressions of the photoabsorption cross sections presented by Sun et al recently were used with the local field models that has proven to be generalized easily to multiatomic systems including molecules and condensed phase systems. The present results show that the variation of the photoabsorption cross sections of atomic xenon in the giant resonance region from the isolated to the condensed conditions is very small, which agrees well with the variation law of the solid and gas experiments.

Chinese Physics BJan 1, 20093 citations

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