Electron impact ion source carrier gas ion removing device
A technology of electron bombardment of ions and carrier gas, which is applied in the field of gas chromatography-mass spectrometry, can solve problems such as complexity, energy loss, and unsatisfactory removal of carrier gas ions, and achieve the effects of reducing impact, reducing noise, and simple structure
Pending Publication Date: 2017-06-20
JINAN UNIVERSITY
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Problems solved by technology
These techniques are very complicated, consume energy, and the removal effect of carrier gas ions is not ideal
Method used
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Embodiment
[0023] Such as figure 1 As shown, this embodiment provides an electron bombardment ion source carrier gas ion removal device, which sequentially includes an electron bombardment ion source, an ion focusing lens 3, a radio frequency quadrupole 6, a time-of-flight analyzer 7 and a detector 8 , the sample and the carrier gas are first ionized by the electron bombardment ion source, and then focused by the ion focusing lens 3, the carrier gas ions are removed by the RF quadrupole 6, and the sample ions reach the time-of-flight analyzer 7 through the RF quadrupole 6 , finally reach the detector 8, the radio frequency quadrupole 6 is arranged between the ion focusing lens 3 and the time-of-flight analyzer 7, the placement direction of the radio frequency quadrupole 6 along the rod length is the same as the transmission direction of the carrier gas ions, four The support rods are connected with radio frequency circuits, and a sine wave of a certain frequency is coupled to any pair of...
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Abstract
The invention discloses an electron impact ion source carrier gas ion removing device. The device sequentially comprises an electron impact ion source, an ion focusing lens, a radio frequency quadrupole rod, a time-of-flight analyzer and a detector, wherein the radio frequency quadrupole rod is arranged between the ion focusing lens and the time-of-flight analyzer; the arrangement direction of the radio frequency quadrupole rod along the length of the rod is the same as the transmission direction carrier gas ions; four branch rods are connected with radio frequency circuits; any pair of opposite rods therein are coupled with a sine wave of a certain frequency; the radio frequency quadrupole rod transmits sample ions produced by the electron impact ion source into the time-of-flight analyzer; and particular carrier gas ions resonate and become instable by means of the sine wave of the certain frequency and thus are removed. The device removes the carrier gas ions in the ion transmission process, thereby reducing the influence on detection target ions, reducing the noise of background gas, improving the detection limit of a target object, and prolonging the service life of a detector. The device is simple in structure and wide in applicability.
Description
technical field [0001] The invention relates to the field of gas chromatography mass spectrometry, in particular to a device for removing carrier gas ions in an electron bombardment ion source in a gas chromatography mass spectrometry. Background technique [0002] Gas Chromatograph Mass Spectrometer (GC-MS) for short, gas chromatography-mass spectrometry (GC-MS) technology began in the late 1950s, with high chromatographic separation efficiency, accurate quantification and high selectivity of mass spectrometry , Strong identification ability, can provide rich structural information, easy to qualitative and other characteristics, especially suitable for the analysis of volatile or easily derivatized compounds, the most widely used direction is in a series of environments such as pesticide residues, polycyclic aromatic hydrocarbons, polychlorinated biphenyls, etc. Analysis and detection of pollutants. Because these targets are thermally stable and have low polarity, GC-MS ca...
Claims
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IPC IPC(8): G01N30/02G01N30/72H01J49/40H01J49/14
CPCH01J49/14H01J49/147H01J49/40G01N30/02G01N30/72
Inventor 黄正旭田琴琴孙敏丁利清江朱辉高伟李磊彭真
Owner JINAN UNIVERSITY