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Appl Opt. 2002 Mar 1;41(7):1330-6.

Autocompensating interferometer for measuring the changes in refractive index of supercooled water as a function of temperature at 632.8 nm.

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  • 1School of Physical Sciences, Dublin City University, Glasnevin, Ireland. carrolll@tcd.ie


An interferometric arrangement that automatically compensates for thermal expansion was used to examine the changes in the refractive index of liquid water at 632.8 nm as a function of temperature from 10 to -15 degrees C. By combining the results of this research with existing data, we calculated the absolute refractive index in the supercooled region with an accuracy ranging from 3 x 10(-6) to 1 x 10(-6). A direct observation of the refractive-index maximum of water is reported for the first time to our knowledge and found to occur between 0 and 0.1 degrees C.

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