Perturbation theory - Application to 2-, 3-, and 4-electron atoms.
Variational perturbation equations and time- independent Schroedinger equation for two-, three- and four-electron atoms
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Variational perturbation equations and time- independent Schroedinger equation for two-, three- and four-electron atoms
Analytic properties of finite-band models in solids as generalization of Kohn procedure
Compound state resonances in atom/molecule collisions below first excitation threshold energy
For internal rotation in 3-fold tops, the internal axis system (IAS) has been a great convenience because the vibrational angular momentum is constant as is directed along a single axis.
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