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The form of FTMS signals is analyzed for the general case of multiple electrode ICR cells with detailed results for two, eight and sixteen electrodes. The analysis is based on an elongated cylindrical cell to reduce the problem of treating the electric field distribution to two dimensions. The relative contributions of cyclotron and magnetron motion to the detected signal are analyzed for multiple...
A versatile, inexpensive electrospray interface has been constructed and installed on an external source Fourier transform mass spectrometer with a quadrupole ion guide. This interface is readily interchangeable with FAB and MALDI sources, with the main time requirement for changing being the pump-down time. A heated capillary, two skimmers and a set of Einzel lenses are used to deliver ions to...
A thermal ionization source for mass spectrometry has been designed and tested. The ion source is based on a tungsten crucible with a deep cavity into which the sample is loaded. The crucible is heated by high energy electron bombardment from a tantalum filament surrounding the crucible. As the sample evaporates inside the crucible, gaseous analyte atoms are produced which interact with the inner...
A new mode of operation for an in-line surface induced dissociation device in a tandem four sector instrument was developed based on SIMION ion trajectory calculations. The calculations predict that a double deflection mode of operation provides a more focused precursor ion beam at the target electrode compared to a single deflection mode and suggests improved SID efficiencies might be obtained....
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