A first principles study of the electronic properties and bulk modulus （B0） of the fcc and bcc transition metals, transition metal carbides and nitrides is presented. The calculations were performed by plane-wave ps...A first principles study of the electronic properties and bulk modulus （B0） of the fcc and bcc transition metals, transition metal carbides and nitrides is presented. The calculations were performed by plane-wave pseudopotential method in the framework of the density functional theory with local density approximation. The density of states and the valence charge densities of these solids are plotted. The results show that B0 does not vary monotonically when the number of the valence d electrons increases. B0 reaches a maximum and then decreases for each of the four sorts of solids. It is related to the occupation of the bonding and anti-bonding states in the solid. The value of the valence charge density at the midpoint between the two nearest metal atoms tends to be proportional to B0.展开更多
The proton drip line nucleus 18Ne is considered as a system of two protons and a 160 core. The excitation-energy spectrum of 18Ne and the relative-momentum distribution of the two protons emitted from the 6.15 MeV lev...The proton drip line nucleus 18Ne is considered as a system of two protons and a 160 core. The excitation-energy spectrum of 18Ne and the relative-momentum distribution of the two protons emitted from the 6.15 MeV level of 18Ne are calculated using the Faddeev approach.展开更多
基金Project supported by the National Natural Science Foundation of China （Grant Nos 50175082 and 10275049）, and the Fund for the Doctoral Program of Higher Education （Grant No 2002486016）.
文摘A first principles study of the electronic properties and bulk modulus （B0） of the fcc and bcc transition metals, transition metal carbides and nitrides is presented. The calculations were performed by plane-wave pseudopotential method in the framework of the density functional theory with local density approximation. The density of states and the valence charge densities of these solids are plotted. The results show that B0 does not vary monotonically when the number of the valence d electrons increases. B0 reaches a maximum and then decreases for each of the four sorts of solids. It is related to the occupation of the bonding and anti-bonding states in the solid. The value of the valence charge density at the midpoint between the two nearest metal atoms tends to be proportional to B0.
文摘The proton drip line nucleus 18Ne is considered as a system of two protons and a 160 core. The excitation-energy spectrum of 18Ne and the relative-momentum distribution of the two protons emitted from the 6.15 MeV level of 18Ne are calculated using the Faddeev approach.
