Symmetric orthogonalized intermediate neglect

SINDO symmetrically orthogonalized intermediate neglect of differential overlap... 

MNDO = modified neglect of diatomic overlap MNDO/d = modified neglect of diatomic overlap with d-type orbitals NLDF = nonlocal density functional PM3/d = parametric method three with d-type orbitals SINDOl = symmetrically orthogonalized intermediate neglect of diatomic overlap parametrization one TM = transition metal UFF = universal force field ZINDO = Zemer s intermediate neglect of diatomic overlap. 

Other semiempirical methods which are available for theoretical studies of TM compounds are PRDDO, ZINDO (Zemer s intermediate neglect of diatomic overlap), SINDOl (symmetrically orthogonalized intermediate neglect of diatomic overlap parametrization one), and EHT (see PRDDO Semiempirical Methods Transition Metals and SINDOl Parameterization and Application). 

Semiempirical SCF calculations were done using the approximations NDDO (neglect of diatomic differential overlap) [18], MNDO (modified neglect of diatomic overlap) [19], INDO (intermediate neglect of differential overlap) [20], SINDO (symmetrically orthogonalized INDO [21]) [22], and CNDO (complete neglect of differential overlap) [20, 23]. Another type of approximation [24] to the ab initio method was also applied to OF2 [16]. 

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