Patent ID: 9082599
Filing Date: 2015-07-14
Classification: H01J

Abstract:
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.