Skinny molecular range

Skinny molecular range, [af, a< ) af is defined above, whereas is the maximum threshold at and below which all locally nonconvex domains on the surface of density domains are simply connected. In simpler terms, in the skinny molecular range all nuclei are found within a single density domain, but there are formal "neck regions on the surface of density domains. In the terminology of shape group analysis [2], rings of D) type can be found on the surface of density domains. 

Molecular density range All nuclei of the molecule are found within a common density domain, establishing the essential molecular pattern of bonding. Skinny molecular range There exists at least one multiply connected set on the surface of the density domain DD(X,a) along which the density domain is not locally convex (such as a formal neck region ). 

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