Ion trapping mass spectrometry apparatus
AssigneeHitachi, Ltd.
InventorsTakashi Baba, Izumi Waki
Life of this patent
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Abstract
A mass spectrometry apparatus having a constitution for attaining analysis with high sensitivity and high resolving power comprising a linear radio-frequency quadrupole ion trap and means for avoiding degradation of analysis performance due to field disturbance caused by an end electrode thereof, where said purpose is achieved by means for forming a harmonic potential in the central axis thereof in whose potential ions are resonantly oscillated to be ejected outside of the ion trap for detection along the axis, or by means to eliminate undesirably- degraded signals originating near the ion trap portions that are disturbed by the end electrodes.
Claims11
An ion trapping mass spectrometry apparatus comprising a linear ion trapping electrode structure, a driving power source for trapping ions in the linear ion trapping electrode structure, end electrodes disposed at the end or at an extended portion in the direction of the central axis of the linear ion trapping electrode structure and having a central axis in common for preventing ions from escaping out of the linear ion trapping electrode structure in the direction along the central axis of the electrode structure, a power source for applying a predetermined static voltage to the end electrodes, an ionization means for ionizing a specimen and introducing the ions to the linear ion trapping electrode structure, means for exciting the ions kinetically to oscillate in the linear ion trapping electrode structure and ejecting the oscillated ions to the outside of the electrode structure, and an ion detection means for detecting the ejected ions, further comprising, means for eliminating the effect of the static voltage of the end electrode upon ejecting ions under selection of mass from the linear ion trapping electrode structure.
An ion trapping mass spectrometry apparatus comprising a linear ion trapping electrode structure, a driving power source for trapping ions in the linear ion trapping electrode structure, end electrodes disposed at the end or at an extended portion in the direction of the central axis of the linear ion trapping electrode structure and having a central axis in common for preventing the ions from escaping out of the linear ion trapping electrode structure in the direction along the central axis, a power source for applying a predetermined static voltage to the end electrodes, an ionization means for ionizing a specimen and introducing the ions to the linear ion trapping electrode structure, means for exciting the ions kinetically to oscillate in the linear ion trapping electrode structure and ejecting the oscillated ions to the outside of the electrode structure, and an ion detection means for detecting the ejected ions, where said ions are ejected by a radio-frequency voltage applied to the linear ion trapping electrodes so as to excite the ions kinetically to oscillate in a direction perpendicular to the central axis of the linear ion trapping electrodes, further comprising, means for preventing the ions, that are ejected at a predetermined portion near the end electrode, from reaching the ion detection means.
An ion trapping mass spectrometry apparatus comprising a linear ion trapping electrode structure, a driving power source for trapping ions in the linear ion trapping electrode structure, end electrodes disposed at the end or at an extended portion in the direction of the central axis of the linear ion trapping electrode structure and having a central axis in common for preventing the ions from escaping out of the electrode structure of the linear ion trapping electrode structure in the direction along the central axis, a power source for applying a predetermined static voltage to the end electrodes, an ionization means for ionizing a specimen and introducing the ions to the linear ion trapping electrode structure, means for exciting the ions kinetically to oscillate in the linear ion trapping electrode structure, and an ion detection means for detecting the oscillated ions, where said ions are detected by optical means such as the detection of fluorescence emitted directly from the specimen ions by irradiation of an excitation light or fluorescence emitted by other ion species trapped in the ion trap together with the specimen ions by irradiation of an excitation light, further comprising, means for preventing the fluorescence emitted from a predetermined portion near the end electrode from reaching the fluorescence detection means.
Dependencies are inferred from the claim text.