Mass spectrometer ion trap having asymmetric end cap apertures

摘要

An ion trap for a mass spectrometer is disclosed. The ion trap includes a ring electrode and first and second electrodes which are arranged on opposite sides of the ring electrode. The ring electrode and the first and second electrodes are configured to generate an electric field based on the received RF signal. The first electrode defines a first aperture and the second electrode defines a second aperture, the first aperture and the second aperture being asymmetric relative to each other and configured to generate a hexapole field.

主权项

1. An ion trap for a mass spectrometer configured to analyze a sample, the ion trap comprising:
a center electrode configured to receive a radio frequency (RF) signal; first and second end electrodes which are arranged on opposite sides of the center electrode, wherein the center electrode and the first and second end electrodes are configured to generate, based on the received RF signal, an electric field in an interior space defined by the center electrode, the first end electrode, and the second end electrode, and wherein the first electrode defines a first aperture to the interior space and the second electrode defines a second aperture to the interior space through which ions are preferentially ejected, wherein a diameter of the first aperture and a diameter of the second aperture are substantially asymmetric, and wherein the first electrode and the second electrode are configured to generate a hexapole field caused by the asymmetry between the first aperture and the second aperture.