[en] The authors investigate stabilization of one-dimensional atom in intense laser fields by solving time-dependent Schroedinger equation of one-dimensional atom in intense laser fields in KH frame with pseudospectral method. Our results show that atomic ionization is suppressed in high frequency and superintense laser field but not in moderate intense laser field. (authors)

[en] The transition phase of SrS from NaCl structure (B1) to CsCl structure (B2) is investigated by ab initio plane-wave pseudopotential density functional theory method, and the elastic properties of the B1 and B2 structures are obtained through the quasi-harmonic Debye model. At zero-temperature, the calculated transition pressure 17.9 GPa, which agrees well with the experiment and those calculated by others. The transition pressure varies non-linearly with temperature, and the pressure of the mechanical instability increases linearly with temperature increasing. (authors)

[en] On XG-II, the 1.06 μm laser beam was focused on krypton gas puff target. Then high-temperature plasma was generated and the X-ray spectra in the range of 5.25-7.55 Anstrom was recorded using plate PET crystal spectrometer. Based on relativistic multi configuration interaction, and taking account of CI interaction and correction of Breit, the 3-2 and 4-2 resonance lines of C-like to Mg-like krypton ions have been computed by COWAN codes. The wavelength and intensity factors were calculated in detail. A total of 16 spectral features are identified, and the calculations agree with experimental emission spectra. This work is very helpful for enriching the spectra of krypton ions. (authors)

[en] Mo films deposited by ion beam mixing and electron beam treatment on the stainless steel were irradiated with a hydrogen ion beam. Infrared transmission measurement was selected to analyze Mo films before and after hydrogen ion irradiation in the range between 500 and 4000 cm^-1. By Infrared transmission measurement, we study changes of infrared spectra absorbing peaks of Mo films before and after hydrogen ion irradiation, and discussed mechanism of hydrogen resistance by Mo films. (authors)

[en] The lowest-energy structures and electronic properties of Be_nNa(n= 2-14) clusters were studied by using density-functional theory (DFT) at B3LYP/6-311G (d) level. The equilibrium geometries of Be_nNa clusters with size up to n=14 were determined from a number of possible structural isomers at each size. Our results indicate that Na prefers to be on the periphery of Be clusters. Both Be₄Na and Be₉Na clusters were found to be particularly stable with higher binding energy and larger electronic gap. For all the Be_nNa clusters studied, we found charge transfers from Na to Be site and co-existence of covalent and metallic bonding characteristics. (authors)

[en] Based on rate equation a theoretical study on laser power balance in a resonance multi-step ionization process of atoms has been presented in this paper. The calculation results made for a typical three-level atom show that there is an optimization laser power assignment when the total pumping laser power is limited, and under the optimization laser power assignment the ionization probability of a three-level atom can reach its maximum value. This conclusion is very different from that obtained under saturation excitation conditions. The method used here can be applied to more complicated multi-step ionization process of atoms. (authors)

[en] The triple differential cross sections for low-energy electron impact ionization of the 4s orbital of krypton have been calculated using the modified distorted wave Born approximation in coplanar symmetric energy-sharing geometry and compared with experimental results. It is show that polarization and PCI effects are very important in coplanar symmetric low energy (e, 2e) reaction of electron-impact ionization for Kr(4s²). (authors)

[en] Reflectivities of 3μm-thick Ti film with different hydrogen storage capacity (TiD_c, c=0.5, 1.0, 1.5 and 2.0) and with or without surface oxide were calculated, the results show that neutron reflectometry is an effective method to gain the hydrogen capacity and surface oxidation thickness of Ti film. According to the film thickness to measure, some required specifications of neutron reflectometer were declared too. (authors)

[en] The theory for the cold fusion mechanism is proposed early in 1989 by Prof. Gou Qing-Quan based on atomic, molecular and crystal physics. According to this theory, the cold fusion may be arisen in crystal with produce of excess heat and fusion products ⁴He. After this theory, the remarkable effects of excess heat and the fusion products ⁴He were observed during the electrolysis of heavy water with Pd or Ti electrodes in our experimental researches. These results indicate that the predication in our theory is valid. The further theoretical and experimental research has been studied repeatedly by us in the past eighteen years. The results will be summarized and discussed systematically in this paper. (authors)

[en] The projectile velocity dependence of the kinetic electron emission yield from the interaction of He²⁺, O²⁺ and Ne²⁺ ions with W target is reported in this paper. It is found that for each species ions impacting the kinetic electron emission is linearly increasing with the increasing of impacting velocity in the range of our experiment. Basing on the mechanism of the kinetic electron emission, we analyze the factors which relate to the kinetic emission yield, and finally get the relation between kinetic electron emission and impacting velocity in theory. It shows that the experimental results are consistent with the theoretical results. (authors)