A new version of Rayleigh-Schrodinger perturbation theory.

Perturbation theory is an important technique in physics and quantum chemistry. Although only a few systems can be solved exactly, we can study the effects of a small change in the hamiltonian of a system. By using this technique we can predict, for example, how a molecule responds to an applied electric field or to the presence of a neighbouring molecule. This method provides a framework for understanding anharmonic effects in vibrational spectra, intensities of the spectral lines generally and many other phenomena.Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi