ION DETECTION

摘要

Mass analyzers and methods of ion detection for a mass analyzer are provided. An electrostatic field generator provides an electrostatic field causing ion packets to oscillate along a direction. A pulse transient signal is detected over a time duration that is significantly shorter than a period of the ion oscillation or using pulse detection electrodes having a width that is significantly smaller than a span of ion harmonic motion. A harmonic transient signal is also detected. Ion intensity with respect to mass-to-charge ratio is then identified based on the pulse transient signal and the harmonic transient signal.

主权项

1. A mass analyzer, comprising:
an electrostatic field generator, arranged to provide an electrostatic field causing ion packets to oscillate along a longitudinal direction with a period; a pulse detection electrode arrangement, configured to detect a pulse transient signal over a time duration that is significantly shorter than the period of the ion packet oscillation, wherein the pulse detection electrode arrangement comprises a conversion electrode mounted interior to the mass analyzer, the electrostatic field being configured such that ion packets hit the conversion electrode, causing secondary particles to be emitted and an external detection electrode arrangement mounted exterior to the mass analyzer and located to detect the secondary particles from the conversion electrode; and a processor, configured to identify ion intensity with respect to mass-to-charge ratio, based on the pulse transient signal.