Longuet-Higgins notation

Notice that in this table we retained the Longuet-Higgins notation for the irreducible representations An in accordance to that of ethane [4]. 

The interaction Hamiltonian can be written in the Longuet-Higgins notation as ... 

Similarly to the case of creation operators, the annihilation operators can be denoted in several ways. They have been denoted so far by the most frequently used symbol aj. Of course, any other letter (bi,Ci,etc.) could have been equally well used. If one wants to refer explicitly to the orbitals /i, etc. in question, the Longuet-Higgins notation f, can be used, analogously to /j, xt... 

Consider an orthonormalized basis set % associated with the creation/ annihilation operators /x in the Longuet-Higgins notations (cf. Sect. 2). Let A be a one-electron operator ... 

Theoretical Aspects, Calculations, and Physical Data.—The basis of orbital-corre-pondence analysis in maximum symmetry has been described in terms of the familiar A and S notation, and the relationship to the Woodward-Hoffmann and Longuet-Higgins-Abrahamson analyses of pericyclic reactions discussed. In a useful and... 

We introduce creation and annihilation operators corresponding to each set of these orbitals. In order to distinguish to what type of orbitals the given creation or annihilation orbital is pertinent, we shall use Longuet-Higgins [16] notations xt and for the creation operators and... 

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