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Results of quantitative high-resolution absorption measurements in the range of the w¹Δᵤ←X¹Σg⁺ and a¹Πg←X¹Σg⁺ derived exciton progressions in solid N₂ are reported. The newly observed detailed fine structure of the vibrational bands is analyzed in terms of a sharp zero-phonon line and phonon-assisted exciton transitions. A theoretical analysis based on a strong-exciton-phonon-coupling model leads to good agreement with the observed experimental line shape.
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Boursey et al. (1978) studied this question.
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