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In order to determine the efficiency of different aerosol particles tonucleate ice, an Ice Optical DEpolarization detector (IODE) was developed todistinguish between water droplets and ice crystals in ice nucleationchambers. A laser beam polarized linearly (power: 50 mW, wavelength: 407 nm)is directed through the chamber. The scattered light intensity from particlesis measured at a scattering angle of Θ=175° in bothpolarization components (parallel and perpendicular). The ratio between theperpendicular intensity over the total one yields the depolarization ratioδ. Single particle detection is possible, using a peak detectionalgorithm. For high particle concentrations, a real-time signal averagingmethod can also be run simultaneously.  The IODE detector was used inconnection with the Zurich ice nucleation chamber during the ICIS 2007workshop where ice nucleation experiments were performed with several aerosoltypes. In presence of ice crystals, a depolarization ratio could be measuredon a particle-by-particle basis. Mean values of δ ranged from 0.24 to0.37 and agree well with theoretical calculations

Single ice crystal measurements during nucleation experiments with the depolarization detector IODE