Abstract
A drift-velocity filter to separate a mixture of ions into two groups according to their mobilities is developed and put to the test at pressures near 0.2 Torr. The filter is composed of eight parallel gold foils, alternate foils of which are connected to a high frequency square-wave potential. The transverse electric field applied to the filter allows the ions having mobilities less than a certain value to pass through it. The transmission efficiencies of Li + and Cs + ions in CO 2 are measured as functions both of the frequency and the applied field. More directly, arrival time spectra obtained by a drift-tube experiment demonstrate that the filter efficiently traps the Li + ions, whereas most of the Cs + ions as well as of the Li + · CO 2 cluster ions produced therein can safely pass through it.
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