The Raman frequency shifts of the compound HNO 3 . 2 SO 3 in the liquid state at about 120° are given. The depolarization factors of the majority of the Raman lines have been determined. The strongest Raman line of the spectrum with Δ ∼ ν = 1402 cm −1 (15s, 0.12) is typical for the nitronium ion NO 2 +. The compound HNO 3 . 2 SO 3 has to be considered in all probability as NO 2 + HS 2 O 7 ‐.
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Gerding et al. (1950) studied this question.
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