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Differential Mobility Spectrometer (DMS) is an ion filter, which operates in atmospheric pressure and separates ions based on their characteristic electric field behavior. The ions are created with ion reactions initiated with an ionisation source. In the IonVision DMS, ions are produced with 4.9 keV photoionisation.
The IonVision maximises the ion separation with a special waveform generator which creates ideal square shaped pulses for the DMS filter. Both positive and negative ions are measured simultaneously which maximises the measurement speed.
In the filter, the ionized gas is exposed to an asymmetric waveform. Ideal waveform has two components: high field and low field. When the ions are under the low field, their mobility is a linear function of the field strength. When the ions are exposed to the high field, mobility has a field dependent component and thus it is a nonlinear function of the electric field. When the ions are in the filter, the field forces them to move. Oscillating ions drift towards the walls of the filter if the mobility difference is not compensated. When a small DC-field is superimposed to the oscillating field, the drifting can be cancelled and the ions can pass the filter.
The IonVision maximises the ions separation with a special waveform generator which creates ideal square shaped pulses for the DMS filter. Both positive and negative ions are measured simultaneously which maximises the measurement speed.
email: info@olfactomics.fi
tel: +358 408410698
Address:
Korkeakoulunkatu 7
Kampusareena
FI-33720 Tampere, FINLAND
This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreements No 827034 and No 848682.