Study of Jet‐Cooled Bis(η6‐Benzene)Chromium by Multiphoton Zero Kinetic Energy—Mass‐Analyzed Threshold Ionization Spectroscopy

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Zero kinetic energy‐mass‐analyzed threshold ionization (ZEKE‐MATI) spectra of jet‐cooled (η6‐C6H6)2Cr have been obtained for the first time with use of the 3dz2 → R4px,y Rydberg transition as the initial step of the electronic excitation. The ionization potential of (η6‐C6H6)2Cr determined on the basis of the ZEKE‐MATI experiment is 44087 ± 3 cm−1 (5.4661 ± 0.0004 eV). The binding energy of the R4px,y electron is 17333 ± 3 cm−1. The frequencies of the symmetric metal‐ring stretching vibration and CH umbrella vibration in the gas‐phase ground‐state molecular cation (η6‐C6H6)2Cr+ are 262 ± 5 and 788 ± 4 cm−1, respectively.