Direct-current ion trap
A technology of ion trap and outer cylinder, which is applied in the field of DC ion trap, can solve the problems of difficult processing and production of radio frequency power supply, and achieve the effect of enhanced function and simple overall structure
Inactive Publication Date: 2012-04-11
XIAMEN UNIV
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[0002] A conventional three-dimensional quadrupole ion trap consists of a hyperbolic circular electrode and two caps at both ends. It confines ions in the trap by applying radio frequency voltage, and can be used as an ion storage device and a mass analyzer. , but its ion storage range and mass scanning range have certain limits, and its smooth hyperboloid and precise radio frequency power supply are also difficult to manufacture
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[0020] The following embodiments will further illustrate the present invention in conjunction with the accompanying drawings.
[0021] Such as figure 1 As shown, the embodiment of the present invention is provided with a front electrode 1, an outer cylinder 2, a rear electrode 3 and a center electrode 4; an insulator is used to connect the front electrode 1, the rear electrode 3 and the center electrode 4; the front electrode 1, the outer cylinder 2 and the rear electrode 3 form the outer wall of the ion trap storage cavity, respectively apply positive voltage to the front electrode 1, outer cylinder 2 and rear electrode 3, and apply negative voltage to the center electrode 4 to form a concave potential in the ion trap field.
[0022] The front electrode 1 can be a metal with a central hole, a semiconductor flat plate with a central hole, a curved plate with a central hole, a conductor grid, or a semiconductor grid, etc. The diameter of the central hole can be 0.1 ~10mm.
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A direct-current ion trap relates to a gaseous ion storage device. The direct-current ion trap is provided with a front electrode, an outer barrel, a rear electrode and central electrodes; insulating parts are used for connecting the front electrode, the rear electrode and the central electrodes; the front electrode, the outer barrel and the rear electrode are formed into the outer wall of the storage cavity of the ion trap, positive voltage is respectively applied on the front electrode, the outer barrel and the rear electrode, negative voltage is applied on the central electrodes, and thereby a concave potential field is formed in the ion trap. A radio frequency power supply is not needed, and the overall structure is simple; the quantity of stored ions depends on both the potential differences between the electrodes and the dimension of the trap; by adding suitable background gas, a collision cooling or dynamic reaction device can come into being, and the function is greatly enhanced; theoretically, the direct-current ion trap is applicable to the storage of ions in all mass ranges; the direct-current ion trap has an energy filtration function; and by means of the control of electrode potentials, the flow direction of extracted ions can be guided.
Description
technical field [0001] The invention relates to a gaseous ion storage device, in particular to a DC ion trap. Background technique [0002] A conventional three-dimensional quadrupole ion trap consists of a hyperbolic circular electrode and two caps at both ends. It confines ions in the trap by applying radio frequency voltage, and can be used as an ion storage device and a mass analyzer. , but its ion storage range and mass scanning range have certain limits, and its smooth hyperboloid and precise radio frequency power supply are also difficult to manufacture. In addition, there are currently quadrupole ion traps, rectangular ion traps, etc., all of which need to be controlled by radio frequency electric fields. [0003] In fact, in an appropriate space composed of different electrodes, using DC voltage to form a concave electric potential field can also realize the storage function of ions. The basic working principle of the DC ion trap is to make the ions oscillate in t...
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IPC IPC(8): H01J49/42H01J49/02
Inventor 杭纬
Owner XIAMEN UNIV