In Situ Observation of Surface Chemistry, Growth and Nucleation of Ultrafine Particles in Gas Suspension
Small particles in gas suspension have played an important role in the development of physics. In fact, every physics student is familiar with the observation of the Brownian motion on smoke particles or the determination of the elementary charge in Millikans famous experiment. The particles of the classical experiments can still be imaged in the optical microscope, hence they are in the micrometre size range. The present paper deals with much smaller particles in the nanometre size range where light scattering is so weak that optical detection methods fail. The smallest particles of this class have diameters of ~ 1 nanometre. This establishes a bridge from the physics of aerosol particles to the physics of clusters of a few atoms where quantum phenomena are dominant.
KeywordsPolycyclic Aromatic Hydrocarbon Diesel Engine Combustion Zone Aerodynamic Diameter Spark Ignition Engine
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