Abstract
The Raman spectra of sulphuric acid, deuterosulphuric acid, chlorosulphuric acid, and methanesulphonic acid have been redetermined, and the spectrum of fluorosulphuric acid measured for the first time. The spectra of fluorosulphuric acid – sulphuric acid, chlorosulphuric acid – sulphuric acid, and fluorosulphuric acid – arsenic trifluoride mixtures have also been measured. The spectra of the hydrogen sulphate, deutero sulphate, fluorosulphate, chlorosulphate, and methanesulphonate anions have been obtained in various solvents. Frequencies are assigned to the normal modes of vibration of all these acids and their anions and the assignments are compared with those of previous workers.

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