Hyperpolarizabilities derivative Hartree-Fock theory

S.-Y. Liu and C. E. Dykstra, ]. Phys. Chem., 91, 1749 (1987). Multipole Polarizabilities and Hyperpolarizabilities of AH and AjHn Molecules from Derivative Hartree-Fock Theory. 

Kobayashi, Sasagane and Yamaguchi" have developed the theory of the time-dependent spin-restricted Hartree-Fock method for application to open shell systems (TDROHF). The expression for the cubic hyperpolarizability is obtained from the quasi-energy derivative (QED) method. The theory is applied to the investigation of the frequency-dependent y susceptibility of the Li, Na, K and N atoms. 

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