# THE NEGATIVE ION PHOTOELECTRON SPECTRUM OF $CuMn^{-}$

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 Title: THE NEGATIVE ION PHOTOELECTRON SPECTRUM OF $CuMn^{-}$ Creators: Millam, E. L.; Leopold, D. G. Issue Date: 1997 Publisher: Ohio State University Abstract: The technique of negative ion photoelectron spectroscopy has been used to obtain a vibrationally resolved spectrum of CuMn. The vibrational frequencies of the ground state of $CuMn^{-}$ and the first observed excited state $3075 \pm 20 cm^{-1}$ higher in energy were found to be $211 \pm 10$ and $187 \pm 10 cm^{-1}$, respectively. A lower frequency of $145 \pm 15 cm^{-1}$ was observed for the anion. The spectrum is interpreted in terms of electron detachments from a weakly antibonding $4s\sigma^{*}$ molecular orbital in a $(3d)^{15} (4s\sigma)^{2}(4s\sigma^{*})^{2}$ anion. This produces two slates of CuMn which have a common $(3d)^{15} (4s\sigma)^{2}(4s\sigma^{*})^{1}$ configuration, consistent with their similar vibratioal frequencies and vibrational intensity profiles, but which differ in energy due to the spin coupling of the remaining $4s\sigma^{*}$ electron. These data are compared with previous results in the literature for related transition metal dimers. Description: Author Institution: Department of Chemistry, University of Minnesota URI: http://hdl.handle.net/1811/13862 Other Identifiers: 1997-MG-14