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[en] We study the photo-detachment interference patterns of a hydrogen negative ion in the magnetic field near different dielectric surfaces with a semi-classical open orbit theory. We give a clear physical picture describing the photo-detachment of H"− in this case. The electron flux distributions are calculated at various dielectric surfaces with unchanged magnetic field strength. It is found that the electron flux distributions of H"− are very different in a magnetic field near different dielectric surfaces, namely the dielectric surface has a great influence on the photo-detachment interference pattern of the negative ion. Therefore, the interference pattern in the detached-electron flux distribution can be controlled by changing the dielectric constant. We hope that our studies may guide the future experimental research in photo-detachment microscopy. (paper)
[en] First-principles calculations are performed to investigate the crystal and electronic structures of BiOF crystal and its oxygen vacancy BiO7/8F. By analyzing the energy band structures, the total density of states and the partial densities of states, it is found that the band gaps for the perfect BiOF and BiO7/8F are 3.12 and 2.65 eV, respectively, which are smaller than the experiment value of 3.64 eV. There is a new electronic state within the forbidden band in the BiO7/8F, which could serve as a capture center for excited electrons, consequently improves the effective separation of electron-hole pairs, and makes the optical absorption band edge red shift. The calculated results demonstrate that the BiOF crystal and its oxygen vacancy BiO7/8F could be the potential application as photocatalytic semiconductor materials.