High intensity resonance Raman overtone progressions out to ν = 3, 14, 23, 24, 25, 17, and 3 have been observed with 457.9 nm, 476.5 nm, 488.0 nm, 514.5 nm, 530.9 nm, 568.2 nm, and 647.1 nm excitation respectively, for monomeric iodine isolated in an argon matrix. The normalised intensities have been determined and plotted as excitation profiles for the overtones. There is substantial evidence indicating a resonance coupling not only with the 3 ∏ Ou + electronic state of I 2 , but also with the 1 ∏ 1u state. The following spectroscopic constants for matrix‐isolated iodine have been calculated from the wavenumber data: ω e = (213.70±0.22) cm −1 , ω e X e = (0.60±0.01) cm −1 , and ω e Y e = (−0.019±0.002) cm −1 .
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Grzybowski et al. (1975) studied this question.