HIGH RESOLUTION LASER SPECTROSCOPY OF MANGANESE OXIDE, MnO

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1988

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Ohio State University

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The (0,0) band of $A^{6}\Sigma^{+} = x^{6}\Sigma^{+}$ system of gaseous manganese oxide (MnO) near 5600 {\AA} has been recorded at sub-Doppler resolution by intermodulated fluorescence. The spectrum shows impressive hyperfine structure due to the interaction between the $I=5/2$ nuclear spin of Mn and a metal-centred unpaired electron. Particularly interesting are the pronounced internal hyperfine perturbations between the middle two electron spin components of the ground state which distort the hyperfine patterns severely. The upper electronic state is very heavily perturbed and an avoided crossing pattern with another close-lying electronic state has been found. Numerous satellite branches induced by the perturbations, (some of them with unusual selection rules such as $\Delta N=5$), complicate the spectrum massively. However, they are valuable in that they provide direct spin and hyperfine combination-differences within the ground state. The centre of the band is so dense, even at sub-Doppler resolution, that it can only be analysed by a two- dimensional technique, where the patterns of wavelength resolved fluorescence are recorded at intervals of $0.05 cm^{-1}$, throughout the region.

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Author Institution: Department of Chemistry, 2036 Main Mall, University of British Columbia

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