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NanoEngineering Corporation
...maneuvering matter on a molecular scale...
Slide 1
Conventional DMAVoltage Sweep
Single “pixel”Electrometer
Collected Signal
Ion TrajectoriesSpread out according to size
DMA Bottom Plate
DMA Top Plate
Low Voltage Medium Voltage
No Signal
High Voltage
Wasted SignalsCollected Signal
Air Flow Field
VOLTAGE SWEEP (Duty Cycle = 1%)
Ion
Cur
rent
(fA
)
Sweep Voltage (kV)
Proportional to particle / ion size
Proportional to Particle / ion concentration
Output Spectrum
Sample inlet slit
Sample outlet slit
Electric Field
Ion-trajectories (rays) rotate around inlet slit with increased voltage
NanoEngineering Corporation
...maneuvering matter on a molecular scale...
Slide 2
DMA + CCD
ConstantVoltage
Ion CCD
Ion
Cur
rent
(fA
)
IonCCD Pixel
Proportional to particle / ion size
Output Spectrum
Proportional to Particle / ion concentration
NanoEngineering Corporation
...maneuvering matter on a molecular scale...
Slide 3
First Stage Ion Sampling Slit
Second Stage Ion Sampling Slit
Ion CCD
ConstantVoltage
Mid VoltageLower Voltage Higher Voltage
Ion CCD Ion CCD
DMA2 + CCD
2-Stage Tandem DMAs + CCD
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