title: Properties of aqueous methanesulfonic acid: complex index of refraction and surface tension.
abstract: The complex index of refraction of aqueous methanesulfonic acid (MSA) at room temperature and at concentrations of 1-70 wt. % is presented. The complex index of refraction is obtained in the entire wave-number region from the mid infrared to the ultraviolet-visible regions. An analysis of the infrared spectra reveals a single absorption band, which makes it possible to identify MSA in aqueous H2SO4. The surface tension of 1-99-wt. % aqueous MSA from room temperature to approximately 263 K, depending on the concentration of MSA, is reported. A polynomial parameterization of the surface tension in terms of acid weight fraction and temperature is presented.
authors.affiliation: Department of Chemistry, University of Oslo, PO Box 1033 Blindern, N-0372 Oslo, Norway.
authors.forename: Cathrine E Lund
authors.initials: CE
authors.lastname: Myhre
authors.forename: Barbara
authors.initials: B
authors.lastname: D'Anna
authors.forename: Flemming M
authors.initials: FM
authors.lastname: Nicolaisen
authors.forename: Claus J
authors.initials: CJ
authors.lastname: Nielsen