Playing it cool: The mass‐analyzed threshold ionization (MATI) spectrum of jet‐cooled cobaltocene shows a surprisingly rich vibronic structure which provides high‐resolution adiabatic (Iad.) and vertical (Ivert.) ionization energies of the neutral molecule, as well as vibrational frequencies of the gas‐phase cation. The spectrum is indicative of both Jahn–Teller (JT) and pseudo‐Jahn–Teller (PJT) activity in the 19‐electron [Cp2Co] sandwich complex.
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