Shutter Behavior and Models

3 MODELS AND MODES OF OPERATION 5.3,1 Shutter Behavior and Models 

The width of the waveform pulse applied to wires in an ion shutter is the key parameter in establishing peak widths in a mobility spectrum since the minimum possible width of an ion swarm, before normal diffusion and other influences in the drift region, is set by the shutter pulse time. The minimum time of a pulse, even in a well-designed and well-built instrument, is fixed by the time for ions, under mobility control of the superimposed electric field of the drift tube, to pass from one side of a shutter grid set (reaction region) to the other side (drift region). Injection pulses of about 100 ps are 

---