Device for reducing radio frequency quality discrimination of radio frequency quadrupoles

A mass transmission and radio frequency quadrupole technology, applied in the field of mass spectrometry, can solve the problems of weak quadrupole electric field change, limited detection range, mass-to-charge ratio ions cannot pass through the quadrupole stably, etc.

Active Publication Date: 2019-06-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

However, a problem with this transmission method is that the same DC potential is applied to the four rods of the RF quadrupole, resulting in a certain gradient in the electric field between the two ends of the quadrupole and the end cap electrodes, which is conducive to the forward transmission of ions. ; However, the electric field change in the middle part of the quadrupole is extremely weak, basically similar to the field-free region
Ions with a mass-to-charge ratio that is too large or too small cannot pass through the quadrupole stably, limiting the detection range

Method used

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  • Device for reducing radio frequency quality discrimination of radio frequency quadrupoles
  • Device for reducing radio frequency quality discrimination of radio frequency quadrupoles
  • Device for reducing radio frequency quality discrimination of radio frequency quadrupoles

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Embodiment

[0028] The segmented electrodes are composed of four sets of parallel electrode arrays; each set of electrode arrays is composed of 26 concentric cylindrical electrodes evenly spaced, and the diameter of the cylinder is 12mm; the centers of the four sets of electrode arrays are evenly arranged on a circle with a radius of 11.3mm; The thickness of the cylindrical electrodes is 3mm, and the interval is 0.5mm. Both the lead-in electrode hole and the lead-out hole electrode are ring electrodes with an inner diameter of 2mm, an outer diameter of 40mm, and a thickness of 2mm. DC voltages of 35V and 15V are applied to the electrodes of the lead-in holes and the electrodes of the lead-out holes respectively; the concentric cylindrical electrodes on any one of the four groups of electrode arrays of the segmented electrodes are evenly divided by voltage dividing resistors, and conform to the odd-numbered cylinders Electrodes apply RF power RF2 (frequency 1500KHz, amplitude 300V) through...

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Abstract

The present invention provides a device for reducing the radio frequency quality discrimination of radio frequency quadrupoles. Based on the quadrupole transmission principle, radio frequency power supplies of different frequencies and amplitudes have different transmission quality ranges. In order to reduce the quality discrimination, different radio frequency power supplies are respectively applied to the two adjacent electrodes in a segmented quadrupole electrode array, two alternating radio frequency electric fields are generated in the entire transmission axis direction, two segments of quality range mass-to-charge ratio ions are considered at the same time, and the quality discrimination effect is reduced.

Description

technical field [0001] The invention relates to the field of mass spectrometry, and in particular provides a device for reducing the quality discrimination of radio frequency quadrupole rod transmission. Based on the principle of quadrupole transmission, RF power with a certain frequency and amplitude has a fixed maximum mass transmission range, and ions with too large or too small a mass-to-charge ratio are difficult to transmit through the quadrupole. Background technique [0002] When the classic radio frequency quadrupole operates in the rf-only mode, the radio frequency electric field confines the ions to collide with the neutral background gas molecules to exchange energy and gradually cool down, which can effectively focus the ion beam through the small hole of the lower stage, greatly improving ion transmission efficiency. This was fully reported in "collisional focusing effects in radiofrequency quadrupoles" by Douglas in 1991. However, a problem with this transmi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J49/06H01J49/42
Inventor 陈平王祯鑫赵琨鞠帮玉李海洋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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