According to the closed-orbit theory, we study the influence of elastic interface on the photodetachment of H- near a metallic sphere surface. First, we give a clear physical description of the detached electron movem...According to the closed-orbit theory, we study the influence of elastic interface on the photodetachment of H- near a metallic sphere surface. First, we give a clear physical description of the detached electron movement between the elastic interface and the metallic sphere surface. Then we put forward an analytical formula for calculating the photodetachment cross section of this system. Our study suggests that the photodetachment cross section of H is changed with the distance between the elastic interface and H^-. Compared with the photodetachment cross section of H^- near a metallic sphere surface without the elastic interface, the cross section of our system oscillates and its oscillation is strengthened with the decrease of the distance from the elastic interface to H^-. In additon, our calcuation results suggest that the influence of the elastic interface becomes much more significant when it is located in the lower half space rather than in the upper half space. Therefore, we can control the photodetachment of H^- near a metallic sphere surface by changing the position of the elastic interface. We hope that our work is conducive to the understanding of the photodetachment process of negative ions near interfaces, cavities and ion traps.展开更多
By means of Gibbs-Bogoliubov (GB) thermodynamic variational calculation,the thermodynamic properties of the supercooled liquid metals,such as the 3rd family elements Al,Ga and Tl and transition metal Ti were calculate...By means of Gibbs-Bogoliubov (GB) thermodynamic variational calculation,the thermodynamic properties of the supercooled liquid metals,such as the 3rd family elements Al,Ga and Tl and transition metal Ti were calculated using the hard-sphere (HS) system as reference.The values of mean atomic volume,Helmholtz free energy,internal energy and entropy as well as specific heat at constant volume,isothermal bulk modulus,thermal expan- sion coefficient and specfic heat under constant pressure were evaluated.The glass transition temperature,T_g,is easily obtained from the C_p-T plot.The glass forming ability for metal can be predicted from T_g/T_m,which is in agreement with the experimental results.展开更多
INCO-617 alloy hollow sphere foams with average aperture of about 3 mm and about 0.12 mm wall thickness were fabricated by hollow sphere method.Firstly the wet spheres,which are formed as powder shells from slurry by ...INCO-617 alloy hollow sphere foams with average aperture of about 3 mm and about 0.12 mm wall thickness were fabricated by hollow sphere method.Firstly the wet spheres,which are formed as powder shells from slurry by coating polystyrene balls,were arranged with body-centered cubic(BCC) structure.Subsequently,the sphere stacks were heat-treated in vacuum at 350 ℃ for 40 min to decompose the organic materials,and sintered at different temperatures for different time.The effects of slurry components,sintering temperature and sintering time on the density and porosity of cell wall of hollow sphere foam were studied through Scanning Electron Microscopy.The results show that the densities of INCO-617 alloy hollow sphere foam,increasing with the increase of powder content in slurry,sintering temperature and sintering time,range from 1.112 to 1.216 g·cm-3.Extension of sintering time can reduce the porosity of cell wall,which enhances the compression strength of hollow sphere foam significantly.展开更多
Reported here are several new calculation methods for the inner-sphere reorganization energy of hydrated metal ions involved in electron transfer processes.It is based on the self-exchange model of reorganization and ...Reported here are several new calculation methods for the inner-sphere reorganization energy of hydrated metal ions involved in electron transfer processes.It is based on the self-exchange model of reorganization and utilizes the more exact potential functions between central metal ion and the inner-sphere ligands.The parameters involved are determined via the spectroscopic and thermodynamic data.The predictions of the inner-sphere reorganization energies from those models agree well with the photoemission experimental results.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos.11074104 and 11374133)the Shandong Provincial Higher Educational Science and Technology Program,China (Grant No.J13LJ04)
文摘According to the closed-orbit theory, we study the influence of elastic interface on the photodetachment of H- near a metallic sphere surface. First, we give a clear physical description of the detached electron movement between the elastic interface and the metallic sphere surface. Then we put forward an analytical formula for calculating the photodetachment cross section of this system. Our study suggests that the photodetachment cross section of H is changed with the distance between the elastic interface and H^-. Compared with the photodetachment cross section of H^- near a metallic sphere surface without the elastic interface, the cross section of our system oscillates and its oscillation is strengthened with the decrease of the distance from the elastic interface to H^-. In additon, our calcuation results suggest that the influence of the elastic interface becomes much more significant when it is located in the lower half space rather than in the upper half space. Therefore, we can control the photodetachment of H^- near a metallic sphere surface by changing the position of the elastic interface. We hope that our work is conducive to the understanding of the photodetachment process of negative ions near interfaces, cavities and ion traps.
文摘By means of Gibbs-Bogoliubov (GB) thermodynamic variational calculation,the thermodynamic properties of the supercooled liquid metals,such as the 3rd family elements Al,Ga and Tl and transition metal Ti were calculated using the hard-sphere (HS) system as reference.The values of mean atomic volume,Helmholtz free energy,internal energy and entropy as well as specific heat at constant volume,isothermal bulk modulus,thermal expan- sion coefficient and specfic heat under constant pressure were evaluated.The glass transition temperature,T_g,is easily obtained from the C_p-T plot.The glass forming ability for metal can be predicted from T_g/T_m,which is in agreement with the experimental results.
文摘INCO-617 alloy hollow sphere foams with average aperture of about 3 mm and about 0.12 mm wall thickness were fabricated by hollow sphere method.Firstly the wet spheres,which are formed as powder shells from slurry by coating polystyrene balls,were arranged with body-centered cubic(BCC) structure.Subsequently,the sphere stacks were heat-treated in vacuum at 350 ℃ for 40 min to decompose the organic materials,and sintered at different temperatures for different time.The effects of slurry components,sintering temperature and sintering time on the density and porosity of cell wall of hollow sphere foam were studied through Scanning Electron Microscopy.The results show that the densities of INCO-617 alloy hollow sphere foam,increasing with the increase of powder content in slurry,sintering temperature and sintering time,range from 1.112 to 1.216 g·cm-3.Extension of sintering time can reduce the porosity of cell wall,which enhances the compression strength of hollow sphere foam significantly.
基金Supported by the Natural Science Foundation of Shandong Province
文摘Reported here are several new calculation methods for the inner-sphere reorganization energy of hydrated metal ions involved in electron transfer processes.It is based on the self-exchange model of reorganization and utilizes the more exact potential functions between central metal ion and the inner-sphere ligands.The parameters involved are determined via the spectroscopic and thermodynamic data.The predictions of the inner-sphere reorganization energies from those models agree well with the photoemission experimental results.
