Abstract: Apparatuses, methods, and systems are disclosed for analyzing particles from about 0.001 to about 1 ?m in diameter by controlling a gaseous medium through which the particles travel so that properties of the particles, such as diameter, electrical mobility, and charge, are measured. One embodiment of the disclosed apparatuses includes a particle source generator, a nozzle, a chamber, an electronic gate, and a detector. Resolution of the measurements made by the disclosed apparatuses is improved by use of a mathematical deconvolution of a spread in arrival times generated by particles of different sizes and charge levels and non-ideal background flow velocity variations.