| With the development of space technology,astrophysics,controlled thermonuclear reaction and experimental development in high temperature plasmas,the research of opacity has drawn more and more considerable attentions from 1920s to today.In the case of plasma diagnostics,opacity can be used to determine the properties（density,etc）of plasma for its ability in description of the radiation characteristics in hot dense matter.The required parameters can be provided by opacity for both plasma radiation transport and energy transport.The researches on the absorption of atmospheric molecules to radiation are very important for us to estimate the destructive power of nuclear weapon.The capacities for radiation and absorption of matters are studied by opacity and represented by the photoabsorption cross section.We study the molecular structure and spectrum of N2and N2+for its importance in astrophysics and the highest content of nitrogen in atmosphere.The theoretical calculations on the required results of opacity are essential since the relevant experiments are too rigorous.The major research contents are as follows.（1）The Multi-reference configuration interaction method are used to obtain the potential energy curve and the dipole transition matrix element for the ground state（X1Σg+）and the excited states（a’1Σu-、b1Πu and a1Πg）of N2,and for the ground state（X2Σg+）and the excited states（A2Πu and B2Σu+）of N2+.Besides,the spectrum constant of these states are calculated to estimate the accuracy.（2）Vibrated Schr?dinger equation is solved to obtain the vibrational levels and wave functions for a’1Σu-、b1Πu and a1Πg of N2,and for X2Σg+,A2Πu and B2Σu+of N2+.The vibrational levels can be used to obtain the binding energy.（3）The partition functions of N2 and N2+are obtained respectively by summing over the Boltzmann factors and the products of the number of oscillations for different states.（4）The opacities of N2 and N2+are simulated for different temperatures with fixed pressure（100atm）. |
