Ion enrichment introduction device and method for atmospheric pressure ion source time-of-flight mass spectrometer

A time-of-flight mass spectrometry and atmospheric pressure ion source technology, which is applied in the field of time-of-flight mass spectrometers, can solve the problems of inability to enrich ions and insufficient sensitivity of the instrument, and achieve the effect of high sensitivity and improved detection quality range

Active Publication Date: 2017-01-25
GUANGZHOU HEXIN INSTR CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the conventional ion transmission and introduction system only plays the role of transporting ions, and cannot enrich ions, so when the sample concentration is too low, the sensitivity of the instrument will be insufficient

Method used

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  • Ion enrichment introduction device and method for atmospheric pressure ion source time-of-flight mass spectrometer
  • Ion enrichment introduction device and method for atmospheric pressure ion source time-of-flight mass spectrometer
  • Ion enrichment introduction device and method for atmospheric pressure ion source time-of-flight mass spectrometer

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Embodiment Construction

[0019] This embodiment is based on the transformation of traditional technology, such as figure 1 As shown, it includes an ion reactor 1 , a radio frequency quadrupole 2 , a DC electrostatic quadrupole 3 , a one-dimensional single lens 4 and a repelling region through which ions pass sequentially. The DC electrostatic quadrupole 3 and the one-dimensional single lens 4 modulate the ion beam into a flat shape, effectively reducing ion energy dispersion.

[0020] Such as figure 2 and image 3 As shown, the radio frequency quadrupole 2 is composed of four round rods 21 and four square rods 22, the four round rods 21 and the four square rods 22 are fixed on three fixed round seats, and the radio frequency quadrupole 2 is placed on the whole In a long cylinder made of cylindrical metal, the two sides are respectively the first electrode 5 and the second electrode 6, thus forming a closed chamber, the air pressure in the closed chamber is at 10E - 3 Torr or so. The center of th...

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Abstract

The invention relates to an ion enrichment and lead-in device for an atmospheric ion source time-of-flight mass spectrometer. The ion enrichment and lead-in device comprises an enrichment device and a repelling device, wherein ions sequentially pass through the enrichment device and the repelling device. The enrichment device comprises a closed cavity, wherein a radio-frequency four-level rod, the two ends of the radio-frequency four-level rod are provided with a first electrode with an ion inlet and a second electrode with an ion outlet, the first electrode is connected with a direct current power supply, and the second electrode is connected with a high voltage pulse power supply. The invention further relates to an ion enrichment and lead-in method. A high voltage pulse power supply is led in the second electrode, release of ions is controlled through high level and low level switching of the high voltage pulse power supply, and therefore enrichment of ions is achieved, the enrichment time and the lead-out time of ions are regulated by adjusting the pulse width, the quality detection range of an instrument is widened, and the more the enriched ions are, the higher the sensitivity of the instrument is. The device and the method can be applied to ion enrichment and lead-in of the atmospheric ion source time-of-flight mass spectrometer.

Description

technical field [0001] The invention relates to a time-of-flight mass spectrometer, in particular to an ion enrichment introduction device and method for an atmospheric pressure ion source time-of-flight mass spectrometer. Background technique [0002] The ion transmission and introduction system of the atmospheric pressure ion source time-of-flight mass spectrometer usually uses quadrupole rods and multiple sets of electrostatic lenses. For details, see figure 1 . The ions will first enter the molecular ion reactor 1 (MIR), enter the radio frequency quadrupole 2 (RFQ) after preliminary focusing, and after colliding with the background air molecules and cooling, the kinetic energy of the ions is close to the thermal energy value, and then the cooled ions are accelerated into DC Electrostatic quadrupole 3 (DCQ) and 1D singlet 4. The DCQ3 and one-dimensional single-lens 4 system modulate the ion beam into a flat shape, effectively reducing ion energy dispersion, and can cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J49/04H01J49/40
Inventor 朱辉莫婷孙宁黄正旭高伟周振
Owner GUANGZHOU HEXIN INSTR CO LTD
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