The electronic spectrum of C11 in its linear and cyclic conformation
Literature Information
Max Mühlhäuser, George E. Froudakis, Sigrid D. Peyerimhoff
Large-scale multi-reference configuration interaction calculations are employed to differentiate in the electronic spectrum between the linear and cyclic isomers of C11 by certain fingerprints. The 1Σu+←X1Σg+ transition of the linear isomer is calculated at 4.02 eV in reasonable agreement with the recently measured 3.69 eV in a neon matrix. The yet to be observed 1Πu←X1Σg+ transition is computed at 2.13 eV. The spectrum of cyclic C11 is characterized by three strong transitions calculated at 3.94 eV (31B2), 4.03 eV (31A1) and 4.59 eV (41B2). In addition the first transition of cyclic C11 occurs at 1.04 eV (11B1←X1A1) but this transition is energetically close to the dipole-forbidden 1Δu state of the linear isomer to which transitions become allowed in cis-bending displacements.
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