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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. 80, 626 (1984)] is shown to belong to a zero order D3h 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 ωe =76.4 cm−1 and ωexe=0.53 cm−1. Trimer constants from the resonance Raman spectra in argon are (ωs−2xs)=196.79 cm−1, ωa=130.15 cm−1, Dωa =2.95 cm−1, xa=0.06 cm−1, and xas=0.79 cm−1. Independent values of ωs and xs could not be determined from our spectral data.

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