# THE CO-DIMER: NEW STATES AND TUNNELING SPLITTING

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 Title: THE CO-DIMER: NEW STATES AND TUNNELING SPLITTING Creators: Surin, L. A.; Fourzikov, D.; Winnewisser, G.; Dumesh, B. S.; Panfilov, V. Issue Date: 2004 Publisher: Ohio State University Abstract: New extensive millimeter-wave measurements of the $^{12}C^{16}O$ dimer have been made and more than 250 new spectral transitions have been observed in the frequency range of 80 - 135 GHz. Joint analysis of these and previous millimeter-wave data yielded in determination and precise location of 34 new energy levels of $A^{+}$ -symmetry and 21 levels of $A^{-}$-symmetry. Some of them belong to already known stacks and others make up 9 new stacks of the dimer. These new energy levels are located at energies from 8 to $18 cm^{-1}$ and in a free rotation limit they correspond to the states with $(j_{1}, j_{2}, K) = (1, 1, 0), (1, 1, 1), (1, 1, 2)$ and (2, 0, 2), where j is a rotational quantum numbers of the CO monomer and K is a projection of the total angular momentum on the intermolecular axis. One newly observed state of $A^{+}$ -symmetry originating at $12 cm^{-1}$ has $K = 0$ and might be tentatively attributed to the lower tunneling component of the stretching vibration of the CO-dimer. The tunneling splitting for many different states of two isotopic modifications of the dimer, $(^{12}C^{16}O)_{2}$ and $(^{13}C^{16}O)_{2}$ was determined, and its dependence on J-, K- values and on isotopic mass was studied. For some states the tunneling splitting increases in $(^{13}C^{16}O)_{2}$ as compared to $(^{12}C^{16}O)_{2})$. Possible explanations of this anomalous behavior will be discussed. Description: Author Institution: I. Physikalisches Institut, University of Cologne; I. Physikalisches Institut, Institute of Spectroscopy URI: http://hdl.handle.net/1811/21466 Other Identifiers: 2004-TJ-06