Structure and Property of Ladder Electrode Linear Ion Trap Mass Analyzer

The theoretical simulation and optimization of a new linear ion trap mass analyzer-ladder electrode ion trap mass analyzer (LeLIT) was described. The LeLIT was consisted of two pairs of ladder electrodes and one pair of end-electrodes. Compared with conventional rectilinear ion trap (ReLIT) which is built with plate electrodes, LeLIT can adjust and optimize the electric field distribution to obtain optimal performance. Meanwhile, the structure of LeLIT is more similar to the geometrical structure of hyperbolic electrode than that of ReLIT, but it is much easier for processing compared with hyperbolic electrode. According to the simulation results, the optimization of electric field distribution inside the ion trap could be realized through adjusting its geometric parameters such as height, width and field radius ratio of ladder electrodes, which was expected to further optimize the mass spectrometry performance of ion trap. As indicated by theoretical simulation results, mass resolution of 10150 at the scanning speed of 225 Da s−1 was obtained with a LeLIT (dimension of X0 × Y0 = 9 mm × 5 mm). LeLIT can significantly improve the mass resolution while maintaining its simple structure. As indicated by the preliminary experiment results, LeLIT has a good analyzing performance as tandem mass spectrometry.

The research mainly foucuses on investigation of ladder electrode ion trap mass analyzer (LeLIT). As compared with conventional rectilinear ion trap, the electric field distribution inside LeLIT can be adjusted and optimized for optimum performance. LeLIT can significantly improve the mass resolution while maintaining its simple structure.Figure optionsDownload as PowerPoint slide