Abstract
The ratio between the transverse diffusion coefficient and the mobility for ions in argon has been determined from directly measured transverse current density distribution profiles of mass-analysed ions, as a function of the ratio between the electric field and the gas number density in the interval Td, at gas temperature T = 294 K using a variable-length drift tube mass spectrometer. The error (two standard deviations) in the results is believed to be less than % for Td, thereafter gradually increasing to % at 4000 Td. The results are compared with moment theory calculations based on an analytical four-parameter model potential. The agreement between measured and calculated values is very good except at the highest -values.
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