Abstract
The resonance Raman spectra of mass-selected chromium trimers (Cr3) in argon matrixes have been obtained. Five resonance Raman transitions were observed between 450 and 690 nm. Four of them are assigned to a totally symmetric (a1‘) vibrational progression, from which we obtain a ground-state harmonic frequency of ωe = 432.2 cm-1 with ωexe = 16.3 cm-1. The other Raman line, observed at 302.0 cm-1, is assigned to the degenerate bending motion v2(e‘) of the triatomic metal cluster. The geometry of the ground state is that of an equilateral triangle (D3h). These results provide a value of the stretching force constant of ke = 1.91 mdyne/A and a spectroscopic atomization energy of 0.36 eV.
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