In 1995, before the work of Seppelt and Pfennig, Landis and coworkers had already predicted a distorted trigonal prismatic structure based on valence bond theory and VALBOND calculations.
42.
As valence bond theory builds the molecular wavefunction out of localized bonds, it is more suited for the calculation of ionization energies and the understanding of spectral absorption bands.
43.
In the language of valence bond theory, the carbon atoms in an alkyne bond are sp hybridized : they each have two unhybridized p orbitals and two sp hybrid orbitals.
44.
Since the 1980s, the more difficult problems, of implementing valence bond theory into computer programs, have been solved largely, and valence bond theory has seen a resurgence.
45.
Since the 1980s, the more difficult problems, of implementing valence bond theory into computer programs, have been solved largely, and valence bond theory has seen a resurgence.
46.
In valence bond theory, when carbon forms compounds, one of the 2s electrons is excited into the 2p state resulting in a configuration of 1s 2 2s 1 2p 3.
47.
This rising-edge transition can be fitted to a valence bond configuration ( VBCI ) model to obtain the composition of the ground state wavefunction and information on ground state covalency.
48.
Shortly after the high-temperature superconductors were discovered, Anderson and Kivelson et al . proposed a " resonating valence bond " ground state for these materials, written as
49.
In 1987 88, Baskaran, along with P . W . Anderson at Princeton University, developed the resonating valence bond theory to describe the behavior of high-temperature superconductors.
50.
Spin-coupled valence bond theory has been applied to diazomethane and the resulting orbital analysis was interpreted in terms of a chemical structure in which the central nitrogen has five covalent bonds;
