Experimental Measurement of Carbon Dioxide Polarizability in the Solid State

We have experimentally determined the polarizability of \(\hbox {CO}_{2}\) using the Lorentz–Lorenz equation by simultaneously measuring the density and the refractive index. The \(\hbox {CO}_{2}\) conditions were solid phase, \(10^{-7}\) mbar pressure, and temperature range 10–86 K. The polarizability value compares well with previous gas-phase experimental results and the results from simulations, and does not depend on the temperature of \(\hbox {CO}_{2}\) ice formation. This value is constant in the temperature range studied, despite a structural change from amorphous to crystalline.