Measurement of refractive index and equation of state in dense He, H2, H2O, Ne under high pressure in a diamond-anvil cell

Details Measurement of refractive index and equation of state in dense He, H2, H2O, Ne under high pressure in a diamond-anvil cell Measurement of refractive index and equation of state in dense He, H2, H2O, Ne under high pressure in a diamond-anvil cell

2002-10-17

arxiv.org/abs/cond-mat/0210378v3

Physics

Condensed Matter

Materials Science

10 pages, 10 figures, accepted jan. 03 in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.67.094112

We present an accurate determination of the refractive index of hydrogen, helium, H2O and neon up to 35 GPa at ambient temperature. The experimental method is based on the combination of two interferometric signals of the Fabry-Perot cavity containing the sample in the diamond anvil cell. The data are put in perspective through the variation of the molecular polarisability with density. Significant electronic changes are observed. Interesting possibilities of the method are also illustrated: the high precision to finely probe phase transition; the simultaneous measurement of the volume to obtain the equation of state of transparent media with around 1 % accuracy.

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