Abstract
The bipolar diffusion charging of particles, suspended in argon is investigated. Particle charge is measured as function of particle size and ion concentration. Since rare gases do not attach electrons, free electrons are available in the gas. This leads to a large difference in mobility and attachment coefficients between negative and positive charge carriers and also of the resulting particle charge. Additionally, negatively charged particles have a maximum as function of the ion concentration, before the equilibrium is reached. This can be explained by the existence of two types of negative charge carriers: free electrons and negative ions, formed by attachment of electrons to impurities in the gas.
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