Optimization of the mass reflector parameters for direct ion extraction
The parameters of a mass reflector combined with direct ion extraction are optimized to reduce the time-of-flight spread caused by the initial velocity distribution of ions. Under the assumption that the initial ion velocity distribution is mass independent, one can find the mass range where the spread reaches its minimum by varying the electric field in the ion mirror. The mass dependence of this particular time-of-flight spread can be diminished when the electric field in the ion mirror changes with time. This was theoretically demonstrated for the mass region 5 x 10(3) < m < 10(5) Da, under conditions where the electric field in the mirror increases by approximately 20% during a time interval of several hundred microseconds. Copyright 2000 John Wiley & Sons, Ltd.
Moskovets
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Department of Chemistry, The George Washington University, Washington, DC 20052, USA.