METHOD OF MEASURING THE MOBILITY SPECTRUM VERSUS AGENING OF ATMOSPHERIC IONS

A new principle of studying the mobility spectrum versus agening of at mospheric ions has been developed. By exposing generated ions to an ai rstream and a counteracting adjustable electric field, the level when the force of the electric field will be greater than the mechanical (r epresented by the airstream) can be stated. By measuring the ion curre nt versus the electric field at a fixed air stream, the mobility spect rum can be deduced. By selecting different values for air speed, elect ric field and traveling distance for the ions, the mobility spectrum v ersus agening of the ions can be deduced. Examples of recordings toget her with analysis are given.