Electric polarizability of isolated ${\mathrm{C}}_{70}$ molecules

We present the gas phase measurement of the static electric dipole polarizability of ${\mathrm{C}}_{70}$ fullerenes. The value is $102\pm 14{\AA }^3.$ The increase in polarizability from ${\mathrm{C}}_{60}$ to ${\mathrm{C}}_{70}$ is discussed and compared to different theoretical predictions.