The resonance Raman and visible absorbance spectra of matrix isolated Mn2 and Mn3

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Abstract
The resonance Raman spectrum obtained from manganese containing argon matrices previously assigned to the dimer [M.Moskovits, D.P.DiLella, and W.Limm, J. Chem. Phys. 8 0, 626 (1984)] is shown to belong to a zero order D 3h trimer subject to Jahn–Teller distortions. The actual resonance Raman spectra of the dimer in both argon and krypton matrices are reported and discussed along with the visible absorption spectra. The resonance Raman of manganese dimer in krypton gives the 1Σ+ g ground state constants of ω e =76.4 cm− 1 and ω e x e =0.53 cm− 1. Trimer constants from the resonance Raman spectra in argon are (ω s −2x s )=196.79 cm− 1, ω a =130.15 cm− 1, Dω a =2.95 cm− 1, x a =0.06 cm− 1, and x a s =0.79 cm− 1. Independent values of ω s and x s could not be determined from our spectral data.