CN215118827U - Reflection type time-of-flight mass spectrometer - Google Patents

Abstract

The utility model discloses a reflective time-of-flight mass spectrometer, including ion source 1, flight pipe and detector 4, the intraductal ion reflector 2 and two sets of periodic lens 3 that is equipped with two sets of symmetries of flight, every group ion reflector 2 comprises a plurality of flat plate electrodes that become rectangle window 21, all rectangle window 21's the same height, width diminish gradually, all the medial surface of rectangle window 21 forms the semicylinder curved surface, and is two sets of crisscross setting from top to bottom between a plurality of battery of lens 31 on the periodic lens 3, ion source 1 sets up the intermediate position in flight pipe one end, detector 4 sets up the other end intermediate position at the flight pipe. The utility model discloses form coil spring form orbit flight for ion is greater than the time of straight tube flight far away at flight intraductal flight time, has greatly improved ion flight time, has improved detection quality's accuracy nature.

Description

Reflection type time-of-flight mass spectrometer

Technical Field

The utility model relates to a time of flight's mass spectrograph technical field especially relates to a reflection-type time of flight mass spectrograph.

Background

Time-of-flight mass spectrometers (TOF MS) are becoming increasingly popular both as stand-alone instruments and as part of a tandem configuration of mass spectra such as Q-TOF or TOF-TOF. They provide a unique combination of high speed, sensitivity, resolving power (resolution), and mass accuracy. The flight time of the ions is an important factor for detecting the mass accuracy, and because the length of the flight tube is limited by the size of the instrument, the ions are reflected to turn back and measure the speed, so that the flight time of the ions in the flight tube is greatly improved, and the detection accuracy is improved. However, how to solve the reentry flight and enable multi-directional orbital flight will be an important reference for reflective time-of-flight orbital flight.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, an object of the utility model is to provide a reflection type time of flight mass spectrograph, solved time of flight mass spectrograph in the ion time of flight weak point, the problem that the detection accuracy is low.

According to the utility model provides a reflective time-of-flight mass spectrometer, including ion source, flight pipe and detector, the intraductal ion reflection mirror and the two sets of periodic lens that are equipped with two sets of symmetries of flight, every group the ion reflection mirror comprises the flat plate electrode of a plurality of rectangular windows that become, all the same height of rectangular window, width diminish gradually, all the medial surface of rectangular window forms the semicylinder curved surface, and is two sets of crisscross setting from top to bottom between a plurality of battery of lens on the periodic lens, the ion source sets up the intermediate position in flight pipe one end, the detector sets up the other end intermediate position at the flight pipe.

In some embodiments of the present invention, the ion flight outlet of the accelerating electrode on the ion source is at an angle of 5-10 ° to the flight tube.

In other embodiments of the present invention, each group of the ion reflectors is a non-window reflector having an outermost rectangular window, and the inner side wall of the non-window reflector is an inner concave arc surface.

In other embodiments of the present invention, the thickness of the rectangular windows is 5-8mm, and the width of the gap between adjacent rectangular windows is 2-3 mm.

In other embodiments of the present invention, an isolation layer is disposed between lens groups on each group of the periodic lenses, and the lens groups include two ion lens sheets that are vertically symmetric.

In other embodiments of the present invention, the ions emitted from the ion source fly in a spiral spring-like trajectory within the flight tube.

The utility model discloses in, utilize the ion reflector of two sets of symmetries, form a cylinder electric arc field, the electric arc field is formed by the medial surface of a plurality of rectangle windows, the ion that the ion source sent is followed the electric arc field pitch arc flight of one of them ion reflector, enter into a battery of lenses departure on one of them a set of periodic lens, reentrant the electric arc field of another ion reflector, a battery of lenses departure on the periodic lens of another group at last, form coil spring form orbit flight, make the ion in flight intraductal flight time be greater than the time that the straight tube flies far away, ion flight time has greatly been improved, the accuracy nature of detection quality has been improved.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of a reflection type time-of-flight mass spectrometer provided by the present invention.

Fig. 2 is a schematic structural diagram of a set of ion mirrors provided by the present invention.

Fig. 3 is the utility model provides a section schematic diagram in flight tube in reflection-type time-of-flight mass spectrometer.

Fig. 4 is a schematic diagram of two sets of periodic lens positions according to the present invention.

In the figure: 1. an ion source; 2. an ion mirror; 21. a rectangular window; 22. a non-window mirror; 3. a periodic lens; 31. a lens group; 32. an isolation layer; 4. a detector.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

Referring to fig. 1-4, a reflective time-of-flight mass spectrometer includes an ion source 1, a flight tube and a detector 4, the flight tube is provided with two sets of symmetrical ion reflectors 2 and two sets of periodic lenses 3, each set of ion reflector 2 is composed of a plurality of flat electrodes forming a rectangular window 21, all the rectangular windows 21 have the same height and gradually reduced width, the inner side surfaces of all the rectangular windows 21 form a semi-cylindrical curved surface, a plurality of lens sets 31 on the two sets of periodic lenses 3 are arranged in an up-and-down staggered manner, the ion source 1 is arranged at the middle position of one end of the flight tube, and the detector 4 is arranged at the middle position of the other end of the flight tube.

After the ion source 1 is irradiated by laser, a sample is converted into ions from molecules, ionization is realized, the ionized ions are accelerated by an accelerating electrode, fly out of the ion source 1, enter a flight tube, obliquely enter an ion reflector 2 to fly, fly (are repelled by an arc field) around the inner side wall of the ion reflector 2, fly out of a periodic lens 3, enter another ion reflector 2 to fly, enter another periodic lens 3 again to form a cycle, and enter a detector for inspection after the flight is finished in the flight tube.

The ion flying outlet of the accelerating electrode on the ion source 1 and the flying tube form an included angle of 5-10 degrees.

The included angle is small, the number of flying turns (under the flying pipe with the same length) is increased, but the angle is not easy to be too small, otherwise, the flying is impossible to wind, and descending annular flying is formed.

Each group of ion reflector outermost rectangular windows are non-window type reflectors 22, and the inner side walls of the non-window type reflectors 22 are concave cambered surfaces.

Ions are prevented from flying out at the outermost side of the ion reflector, the side edges are set to be the non-window type reflector 22, and the ions form large radian overturning flight at the position of the non-window type reflector 22.

The thickness of the rectangular windows 21 is 5-8mm, and the width of a gap between adjacent rectangular windows 21 is 2-3 mm.

The gap width between the adjacent rectangular windows 21 is not too large easily, so that gap electric arcs are prevented, the bending effect of flying ions is poor, and the width of the rectangular windows 21 has a certain thickness, so that an electric arc field is formed conveniently.

An isolation layer 32 is arranged between the lens groups 31 on each group of periodic lenses 3, and each lens group 31 comprises two ion lens sheets which are symmetrical up and down.

The isolation layer 32 effectively isolates mutual interference between the lens groups 31.

The ions emitted from the ion source 1 fly in a spiral spring-like trajectory in the flight tube.

Spring-shaped flight is formed, so that the flight time is obviously longer than that of straight flight, and the accuracy of flight time detection is greatly improved.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims (6)

1. A reflective time-of-flight mass spectrometer, characterized by: including ion source (1), flight tube and detector (4), the intraductal ion reflector (2) and two sets of periodic lens (3) that are equipped with two sets of symmetries of flight, every group ion reflector (2) comprise a plurality of flat plate electrodes that become rectangle window (21), all the height the same of rectangle window (21), width diminish gradually, all the medial surface of rectangle window (21) forms the semicylinder curved surface, and is two sets of crisscross the setting from top to bottom between a plurality of battery of lenses (31) on periodic lens (3), ion source (1) sets up the intermediate position in flight tube one end, detector (4) set up the other end intermediate position in flight tube.

2. A reflective time-of-flight mass spectrometer according to claim 1, wherein: the ion flying outlet of the accelerating electrode on the ion source (1) forms an included angle of 5-10 degrees with the flight tube.

3. A reflective time-of-flight mass spectrometer according to claim 1, wherein: every group ion reflector outermost side rectangle window is non-window formula speculum (22), the inside wall of non-window formula speculum (22) is the cambered surface of indent.

4. A reflective time-of-flight mass spectrometer according to claim 1, wherein: the thickness of the rectangular windows (21) is 5-8mm, and the width of a gap between every two adjacent rectangular windows (21) is 2-3 mm.

5. A reflective time-of-flight mass spectrometer according to claim 1, wherein: an isolation layer (32) is arranged between lens groups (31) on each group of periodic lenses (3), and each lens group (31) comprises two ion lens sheets which are symmetrical up and down.

6. A reflective time-of-flight mass spectrometer according to claim 1, wherein: ions emitted by the ion source (1) fly in a spiral spring-shaped track in the flight tube.

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