Ak. Das et Pk. Mukherjee, TIME-DEPENDENT COUPLED GEMINAL APPROACH FOR MANY-ELECTRON ATOMIC-STRUCTURE CALCULATIONS, Physica scripta. T, 55(4), 1997, pp. 422-424
Many-electron system is decribed in terms of pair functions or geminal
s. A new formalism based on the linearized version of the time-depende
nt perturbation theory has been developed to study the natural excitat
ion modes of the geminals. Correlated basis set is used to describe th
e pair functions.