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[en] In strong field above threshold ionization, we reproduce the “plateau structure” of the photoelectron spectra by using some important rescattering points. The corrected result is in good agreement with the semiclassical simulation which takes the full Coulomb influence into consideration. This indicates that the Coulomb influence in the rescattering process mainly functions in the area where the electron kicks the parent ion. A chaotic channel caused by the rescattering points appears when the initial transverse velocity of the electron can nearly counteract the drift velocity induced by the laser field. It is also found that the different order rescattering points play a different role in the formation of the chaotic channel and that the rescattering number is very important in determining the final energy of electron. Graphical abstract: .
[en] Based on closed-orbit theory, the influence of an interface modifier on the photodetachment of H- in an electric field near a metal surface is studied. It is demonstrated that the interface strengthens the oscillations in the photodetachment cross section. However, when the electric field environments are different, the strengthening oscillations are caused by different sources. When the electric field direction is upward, the interface enhances the oscillations by shortening the period and the action of the closed orbit. When the electric field direction is downward, the interface strengthens the oscillations either by extending the coherent energy range or by increasing the total number of the closed orbits. We hope that our results will be conducive to the understanding of the photodetachment process of negative ions near interfaces, cavities and ion traps. (atomic and molecular physics)
[en] Based on the closed-orbit theory, the magnetic field effect in the photodetachment of negative ion in the electric field near a metal surface is studied for the first time. The results show that the magnetic field can produce a significant effect on the photodetachment of negative ion near a metal surface. Besides the closed orbits previously found by Du et al. for the H− in the electric field near a metal surface (J. Phys. B 43 035002 (2010)), some additional closed orbits are produced due to the effect of magnetic field. For a given ion—surface distance and an electric field strength, the cross section depends sensitively on the magnetic field strength. As the magnetic field strength is very small, its influence can be neglected. With the increase of the magnetic field strength, the number of the closed orbits increases greatly and the oscillation in the cross section becomes much more complex. Therefore we can control the photodetachment cross section of the negative ion by changing the magnetic field strength. We hope that our results may guide future experimental studies for the photodetachment process of negative ion in the presence of external fields and surfaces. (atomic and molecular physics)