Applications of inward matrix products and matrix wave functions to Hückel MO theory, Slater extended wave functions, spin extended functions, and Hartree method

AbstractThe operation of inward matrix product and the concept of extended wave functions are jointly invoked to set up a general theoretical framework to obtain a new look at old quantum chemical procedures like Hückel method, Hartree theory, and some related questions. Among the discussion of several problems, the spin orbitals are presented as a matrix signature option, associated with an extended wave function in matrix form, common to both Hückel and Hartree theories, as well as in the fundaments of Slater determinants construction. © 2002 Wiley Periodicals, Inc. Int J Quantum Chem, 2003