Abstract
The absolute refractive index of liquid sulphur dioxide (SO2) was determined with an uncertainty of ±0.0007 with the help of aMichelson interferometer and a computer-controlled rotatory stage supporting arectangular fused silica cell, containing the liquid. The measurements wereperformed at temperatures around 20 °C for the laser linewavelengths 632.8, 514.5 and 488.0 nm. The experimental data were fitted tothe simple Cauchy dispersion formula. The results calculated from this formulaare consistent within the experimental uncertainty with published valuesobtained at other wavelengths and/or other temperatures.
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