Vista University

About: Vista University is a based out in . It is known for research contribution in the topics: Boron trifluoride & Higher education. The organization has 225 authors who have published 336 publications receiving 3345 citations.

On the energetics of the dimerization of boron trifluoride

Abstract: The energetic pathways for the formation of a number of dimers of boron trifluoride, of symmetry D 2 h , C 2 h and C s , have been followed by means of a series of molecular orbital calculations at the ab initio level. It is concluded that the large amount of energy required to distort a boron trifluoride monomer, by lengthening one of the BF bonds or by changing the values of the FBF angles of the monomer, in order to react with a similarly distorted monomer to form either of the D 2 h structures, mitigates against these structures being the preferred configuration. In contrast, the distortion of a monomer unit to form the non-planar cyclic C 2 h species, or the bent or linear C s dimers, is minimal, and the energy recovered on the reaction of two such distorted monomers is sufficient in these cases to cause the process to be exothermic overall. In the case of the planar C 2 h dimer, while the balance of the distortion energy and the recombination energy of the monomers leads to an exothermic process overall, the large basis set superposition error contribution more than compensates for this, resulting in an endothermic reaction pathway.

Construct Validity of the Commitment to Career Choices Scale among South African University Students

Abstract: Factor analysis of 190 South African university undergraduates' responses to the Commitment to Career Choices Scale showed considerable similarity of factors with those in Blustein, et al.'s 1989 work and supports the construct validity of the scale. However, omission of certain items from the two dimensions is recommended.