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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Nonnuclear Attractors in Heteronuclear Diatomic Systems

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Author(s):
Terrabuio, Luiz Alberto [1] ; Teodoro, Tiago Quevedo [1] ; Matta, Cherif F. [2, 3] ; Andrade Haiduke, Roberto Luiz [1]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Inst Quim Sao Carlos, Dept Quim & Fis Mol, Av Trabalhador Sao Carlense, 400-CP 780, BR-13560970 Sao Carlos, SP - Brazil
[2] St Marys Univ, Halifax, NS B3H 3C3 - Canada
[3] Mt St Vincent Univ, Dept Chem & Phys, Halifax, NS B3M 2J6 - Canada
Total Affiliations: 3
Document type: Journal article
Source: Journal of Physical Chemistry A; v. 120, n. 8, p. 1168-1174, MAR 3 2016.
Web of Science Citations: 8
Abstract

Nonnuclear attractors (NNAs) are observed in the electron density of a variety of systems, but the factors governing their appearance and their contribution to the system's properties remain a mystery. The NNA occurring in homo- and heteronuclear diatomics of main group elements with atomic numbers up to Z = 38 is investigated computationally (at the UCCSD/cc-pVQZ level of theory) by varying internuclear separations. This was done to determine the NNA occurrence window along with the evolution of the respective pseudoatomic basin properties. Two distinct categories of NNAs were detected in the data analyzed by means of catastrophe theory. Type ``a{''} implies electronic charge transfer between atoms mediated by a pseudoatom. Type ``b{''} shows an initial relocation of some electronic charge to a pseudoatom, which posteriorly returns to the same atom that donated this charge in the first place. A small difference of polarizability between the atoms that compose these heteronuclear diatomics seems to favor NNA formation. We also show that the NNA arising tends to result in some perceptible effects on molecular dipole and/or quadrupole moment curves against internuclear distance. Finally, successive cationic ionization results in the fast disappearance of the NNA in Lie indicating that its formation is mainly governed by the field generated by the quantum mechanical electronic density and only depends parametrically on the bare nuclear field/potential at a given molecular geometry. (AU)

FAPESP's process: 12/22143-5 - Development of polarized relativistic Gaussian-type basis sets and relativistic applications
Grantee:Tiago Quevedo Teodoro
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 10/18743-1 - Employment of multipoles from the quantum theory of atoms in molecules and kinetic studies in systems found in the interstellar medium
Grantee:Roberto Luiz Andrade Haiduke
Support type: Regular Research Grants