Abstract
Publisher Summary Central to freeon dynamics is the indistinguishability of electrons; this property is a symmetry, which is expressed in terms of the symmetric group, S N , the group of permutations on the indices of the N identical electrons. The use of spin to label the freeon spaces, which carry the dynamics of the system, has confused those chemists who are locked into the spin paradigm. The theory of the application of the unitary group to quantum chemistry (together with relevant references) has been developed in Roy Mcweeny's text and in The Unitary Group in Quantum Chemistry (1986), written in collaboration with Ruben Pauncz. The freeon unitary–group formulation is the basis of the Paldus-Shavitt GUGA (graphical-unitary-group approach), an efficient algorithm for large-scale configuration–interaction calculations. The theory and vocabulary of freeon dynamics is quite technical and intimidating, particularly to those unfamiliar with group theory. Fortunately, its application is actually quite simple.
Published Version
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