The predicted spectrum of the hypermetallic molecule MgOMg

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DOIResolve DOI: http://doi.org/10.1039/C0CP02996C
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TypeArticle
Journal titlePhysical Chemistry Chemical Physics
Volume13
Issue16
Pages75467553; # of pages: 8
AbstractThe present study of MgOMg is a continuation of our theoretical work on Group 2 M(2)O hypermetallic oxides. Previous ab initio calculations have shown that MgOMg has a linear (1) (g) ground electronic state and a very low lying first excited triplet electronic state that is also linear; the triplet state has (3) (u) symmetry. No gas phase spectrum of this molecule has been assigned, and here we simulate the infrared absorption spectrum for both states. We calculate the three-dimensional potential energy surface, and the electric dipole moment surfaces, of each of the two states using a multireference configuration interaction (MRCISD) approach based on full-valence complete active space self-consistent field (FV-CASSCF) wavefunctions with a cc-pCVQZ basis set. A variational MORBID calculation using our potential energy and dipole moment surfaces is performed to determine rovibrational term values and to simulate the infrared absorption spectrum of the two states. We also calculate the dipole polarizability of both states at their equilibrium geometry in order to assist in the interpretation of future beam deflection experiments. Finally, in order to assist in the analysis of the electronic spectrum, we calculate the vertical excitation energies, and electric dipole transition matrix elements, for six excited singlet states and five excited triplet states using the state-average full valence CASSCF-MRCISD/aug-cc-pCVQZ procedure.
Publication date
LanguageEnglish
AffiliationNRC Steacie Institute for Molecular Sciences; National Research Council Canada
Peer reviewedYes
NPARC number19734684
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Record identifierae896fc4-1247-472d-b49b-d6d7668c7ed3
Record created2012-03-29
Record modified2016-05-09
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