Polarizability α (ω, T, ρ) of Small Molecules in the Gas Phase

Design and simulation of a plasmonic density nanosensor for polarizable gases

In this paper, an optical method of measuring the mass density of polarizable gases is proposed using a plasmonic refractive index nano-sensor. Plasmonic sensors can detect very small changes in the refracting index of arbitrary dielectric materials. However, attributing them to a specific application needs more elaboration of the material's refractive index unit's (RIU) relation with the introduced application. In a gaseous medium, the optical properties of molecules are related to their dipole moment polarizability. Hence, the theoretical index-density relation of Lorentz-Lorenz is applied in the proposed sensing mechanism to interpret changes in the gas' refractive index and to changes in its density. The proposed plasmonic mass density sensor shows a sensitivity of 348.8nm/(gr/cm³) for methane gas in the visible light region. This sensor can be integrated with photonic circuits for gas sensing purposes.

Electrical mobilities of multiply charged ionic-liquid nanodrops in air and carbon dioxide over a wide temperature range: influence of ion-induced dipole interactions

Polarization correction enables inferring true cross-sections of globular ions from electrical mobility measurements performed in air and carbon dioxide over a wide temperature range (20–100 °C).