PHOTODISSOCIATION SPECTROSCOPY OF THE $Mg^{+}-CO_{2}$ COMPLEX AND ITS ISOTOPIC ANALOGS
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Date
1993
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Publisher
Ohio State University
Abstract
$Mg^{+}-CO_{2}$ ion-molecule cluster complexes are produced by laser vaporization in a pulsed nozzle cluster source. The vibronic spectroscopy in these complexes is studied with mass-selected photodissociation in a reflectron time-of-flight mass spectrometer. Two excited electronic states are observed: $(2)^{2}\Sigma^{+}$ and $^{2}II$. The $2II$ state has a vibrational progression in the metal-$CO_{2}$ stretching mode ($\omega_{e}^{\prime} = 381.8 cm^{-1}$). The complexes are linear ($Mg^{+}-OCO$) and are bound by the charge-quadrupole interaction. The excited state dissociation energy $(D_{o}^{\prime})$ is 32 kcal/mole. The corresponding ground state value $(D_{o}^{\prime})$ is 14.7 kcal/mole. Corresponding spectra are measured for each of the 24,25 and 26 isotopes of magnesium. These results are compared to theoretical predictions made by Bauschlicher and coworkers.
Description
$^{1}$. K.F.Willey, C.S.Yeh, D.L.Robbins and M.A.Duncan, Chem. Phys. Lett. 192, 179(1992) $^{2}$. C.S.Yeh, K.F.Willey, D.L.Robbins, J.S.Pilgrim and M.A.Duncan, J. Chem. Phys. 98, 1867(1993)
Author Institution: Department of Chemistry, University of Georgia
Author Institution: Department of Chemistry, University of Georgia