We present the first experimental data from a linear-type ion trap mass spectrometer with characteristic trapping dimension y0 less than 1 mm. This device is made using an arrangement of two ceramic plates. Electrodes are lithographically patterned onto the facing surfaces of each plate. Appripriate RF amplitudes applied to the electrodes produce the trapping fields. Efforts include two different trap designs. The first includes larger ceramic plates separated by 1.9 mm (y0 = 0.95 mm) and a capacitive voltage divider to provide separate RF signals to ten electrodes (five on each side of the ejection slit). The second design uses smaller ceramic plates spaced 720 microns apart (y0 = 360 microns) and uses only a single RF amplitude, and single RF electrode on each side of the slit, and no capacitors. For the larger design, dipole resonant ejection using both frequency scan and RF amplitude scan show better than unit mass resolution for small organics (such as toluene and dichloromethane). Plate alignment was observed to strongly influence the spectra and is a subject of ongoing investigation. The smaller plate design operates with much lower voltages and has only 1/5 the capacitance of the larger device.

Sub-mm linear ion trap mass spectrometer made using ceramic plates

248th National Meeting (2014)

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