The absorption and resonance Raman spectra of yttrium dimers (Y₂) in argon matrices have been measured for the first time. The absorption spectrum (scattering deplation spectrum SDS) shows a weak, broad transition centered near 485 nm. Resonance Raman spectra obtained by exciting into this absorption band with several visible laser lines (465,5 - 496,5 nm) give a single, sharp progression with up to ten Stokes transitions. These data give omega_e = 184,4(4) cm^-1, with omega_e x_e = 0,30(3) cm^-1, leading to a spectroscopic dissociation energy of D_e = 3,5(4) eV. Comparison of our results with several ab initio calculations adds confirmation to the assignment of the ground state of Y₂ to be ¹SIGMA_g⁺ state.

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