Flight time quality selector structure

Abstract

The utility model relates to the technical field of ion optics, and particularly discloses a time-of-flight mass selector structure which comprises a main body structure, first fixing plates are installed on the two sides of the main body structure respectively, the main body structure comprises a first pulse plate, a second pulse plate, a third pulse plate and a fourth pulse plate, a tungsten wire net is arranged on one side of the third pulse plate, and a third pulse plate is arranged on the other side of the fourth pulse plate. A high-voltage pulse source is arranged on one side of the first pulse plate, and a reverse high-voltage pulse source is arranged between the third pulse plate and the fourth pulse plate. According to the utility model, the time-of-flight mass selector is arranged based on the transverse displacement technology of the ion beams, part of the ion beams are accelerated in the direction perpendicular to the original direction by applying a pulsed electric field, and after drifting for a certain time, the vertical movement of the ion beams is stopped through a reverse pulsed electric field, so that the mass selection function is realized; according to the working principle, ion beams with different masses can generate different transverse displacements according to the mass difference of ions, so that the selection of a specific mass range in the ion beams is realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to ion optics technical field, concretely relates to a time of flight mass selector structure. BACKGROUND

[0002] Time of flight (TOF) mass selector as important device in mass spectrum analysis, is widely used in molecular analysis, chemical research, material science and biomedical etc. multiple fields, TOF mass spectrum technology is through measuring cluster ion beam flow from source to detector's flight time to deduce its mass-charge ratio (m / z), in TOF mass spectrum analysis process, particle is accelerated under the action of electric field, with certain speed flight, flight time is inversely proportional to the mass of particle, thereby can realize the mass selection of particle by accurate measurement flight time, due to its high precision and wide application, TOF mass spectrum has become one of the core tools in modern analysis technology;

[0003] However, the existing TOF mass selector still faces many technical challenges when facing complex cluster particle beam or multiple particle groups, especially when dealing with nanometer cluster particle beam or cluster cluster particle beam; Traditional TOF mass spectrometer mainly relies on high-precision electromagnetic field control to accelerate particles, but due to the limitation of physical structure, the mass selection range of the existing TOF mass selector is usually limited, and it is difficult to efficiently process particles within a large mass range; This often leads to signal attenuation, inaccurate particle selection or information loss when analyzing nanoparticles, clustered particles or complex clusters;

[0004] In addition, while improving the selection accuracy of the TOF mass selector, the existing technology often needs to sacrifice the transmission efficiency, resulting in information loss during particle transmission, affecting the reliability and accuracy of the analysis results, especially when dealing with complex cluster atoms, aggregates or molecular groups, how to simultaneously realize efficient particle screening and wide mass selection range has become a major problem in mass spectrum analysis; Therefore, how to expand the applicable mass range of the TOF mass selector without reducing the transmission efficiency, and improve the screening accuracy of different particle types (especially cluster atoms or aggregate particles) has become a technical challenge that needs to be solved in this field; Solving these problems will greatly improve the application ability and data quality of mass spectrum analysis technology in the fields of nanomaterials, chemical synthesis, life science, etc. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a time of flight mass selector structure to solve the problems raised in the above background technology.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] A time-of-flight mass selector structure comprises:

[0008] The body structure is provided with a fixed plate one on both sides, and a fixed plate two on the front and rear ends, for mounting and fixing the pulse plate one, the pulse plate two, the pulse plate three and the pulse plate four, the fixed plate one is provided with a mounting plate at both ends, for mounting, the body structure comprises the pulse plate one, the pulse plate two, the pulse plate three and the pulse plate four, the upper end of the pulse plate one is provided with the pulse plate two, the upper end of the pulse plate two is provided with the pulse plate three, the upper end of the pulse plate three is provided with the pulse plate four, one side of the pulse plate three is provided with a tungsten wire mesh, one side of the pulse plate one is provided with a high-voltage pulse source, for applying a high-voltage pulse, a reverse high-voltage pulse source is arranged between the pulse plate three and the pulse plate four, for applying a high-voltage pulse opposite thereto, the high-voltage pulse source and the reverse high-voltage pulse source are both devices capable of applying a high-voltage pulse in the prior art, and will not be described in detail here;

[0009] One side of the body structure is provided with an inlet, and the upper end of the other side of the body structure is provided with an outlet.

[0010] Preferably, the mounting plate comprises a mounting main plate and a mounting auxiliary plate, both ends of the fixed plate one are provided with the mounting main plate, and one side of the mounting main plate is connected with the mounting auxiliary plate, and the mounting main plate and the mounting auxiliary plate form an L-shaped structure.

[0011] Preferably, one side of the mounting auxiliary plate is provided with an insulating part one.

[0012] Preferably, the mounting auxiliary plate is provided with an insulating part two.

[0013] Compared with the prior art, the time-of-flight mass selector based on the transverse displacement technology of the ion beam can make different mass ions have different transverse displacements according to the mass difference of the ions, and then realize the selection of a specific mass range in the ion beam.

[0014] The time-of-flight mass selector of the present application improves the performance of the traditional mass analysis method, provides higher transmission efficiency, wider mass selection range and more accurate mass resolution, and is suitable for mass analysis of high-energy cluster particles and nanoparticle beams. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Fig. 2 A schematic diagram of cluster motion trajectory of the utility model;

[0017] In the figure: 1, pulse board four; 2, pulse board three; 3, fixed plate one; 4, pulse board two; 5, pulse board one; 6, installation mainboard; 7, installation vice plate; 8, insulating part one; 9, insulating part two; 10, tungsten wire mesh. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0019] Embodiment:

[0020] Please refer to Figs. 1-2 The time-of-flight mass selector structure comprises:

[0021] The main structure is provided with fixed plate one 3 on both sides, and is provided with fixed plate two on the front and rear ends, for mounting and fixing pulse board one 5, pulse board two 4, pulse board three 2 and pulse board four 1. The two ends of fixed plate one 3 are provided with installation plate for installation. The main structure comprises pulse board one 5, pulse board two 4, pulse board three 2 and pulse board four 1. The upper end of pulse board one 5 is provided with pulse board two 4. The upper end of pulse board two 4 is provided with pulse board three 2. The upper end of pulse board three 2 is provided with pulse board four 1. One side of pulse board three 2 is provided with tungsten wire mesh 10. One side of pulse board one 5 is provided with high-voltage pulse source for applying high-voltage pulse. A reverse high-voltage pulse source is arranged between pulse board three 2 and pulse board four 1 for applying high-voltage pulse in the opposite direction. The high-voltage pulse source and the reverse high-voltage pulse source are devices capable of applying high-voltage pulse in the prior art, which will not be described in detail here.

[0022] One side of the main structure is provided with an inlet, and the other side of the main structure is provided with an outlet at the upper end.

[0023] Referring to Figs. 1-2 As shown in the figure, the installation plate comprises installation mainboard 6 and installation vice plate 7. The two ends of fixed plate one 3 are provided with installation mainboard 6. One side of the installation mainboard 6 is connected with installation vice plate 7. The installation mainboard 6 and the installation vice plate 7 form an L-shaped structure.

[0024] Referring to Figs. 1-2 One side of the installation vice plate 7 is provided with insulating part one 8.

[0025] Referring to Figs. 1-2As shown, the mounting vice plate 7 is provided with an insulating piece two 9.

[0026] By providing a series of high-performance insulating pieces for ensuring electrical isolation between each plate and avoiding current leakage and interference, the insulating pieces are designed to consider stability in high-voltage environments, and materials with excellent electrical insulation properties are used to ensure that the mass selector can operate reliably under high electric fields and high-energy ion beams.

[0027] The working principle is as follows: the cluster particle beam enters from the left side of the mass selector, and under the action of the precisely designed ion optical system, the cluster particle beam is efficiently focused. When a short high-voltage pulse is applied to the pulse plate one 5 by the high-voltage pulse source, the ions in the cluster particle beam will be accelerated to obtain a velocity perpendicular to the original beam direction. Clusters with the same mass will be accelerated between the pulse plate two 4 and the pulse plate three 2, and pass through the tungsten wire mesh 10 to balance the electric field, thereby ensuring uniform electric field distribution and maintaining the stability of the system. Finally, the cluster particles reach between the pulse plate three 2 and the pulse plate four 1, where a reverse high-voltage pulse is applied by the reverse high-voltage pulse source, so that the cluster atoms restore to the original horizontal direction velocity and are released through the upper end outlet.

[0028] The utility model provides a mass selector based on pulse electric field, and its basic principle is to apply a short high-voltage pulse to the ion beam in the transverse direction, so that ions of different masses obtain different transverse displacements. Then, the transverse motion is stopped by using a pulse electric field in the opposite direction, so that the ions return to the original direction, thereby realizing high-precision mass selection. The mass selector mainly comprises the following technical features:

[0029] Mass selection method: the pulse electric field is used to move the ion beam in the transverse direction, so that ions of different masses produce different displacements, thereby realizing mass separation.

[0030] Pulse electric field control: a short high-voltage pulse is applied to the parallel plate electrodes to control the transverse acceleration and deceleration of the ions, so that ions of the same mass obtain the same transverse velocity, and the transverse motion is eliminated in the subsequent stage to make the ions return to the original direction.

[0031] Mass selection accuracy: the transverse displacement of the ions is controlled by using a time-limited pulse electric field, so that ions of different masses form different parallel beams at the outlet position, and the target mass range is selected through a small hole, thereby achieving high mass selection accuracy.

[0032] Ion transmission efficiency: the selected mass ions are again subjected to a pulse in the opposite direction of the acceleration direction when entering the deceleration region, so that they restore the original motion direction, thereby realizing efficient transmission, and the transmittance can reach 50% or higher.

[0033] Time of flight versus mass relation: mass selection relies only on the time of flight required for the lateral displacement of the ions, which is determined by the intensity and duration of the high voltage pulse, and is independent of the forward kinetic energy of the ions;

[0034] Scope of application: the mass selector is suitable for charged particles of different size ranges, from single atoms to nanoscale particles, and can be used for various experimental and industrial applications, such as cluster deposition, ion screening, etc.

[0035] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A time-of-flight mass selector structure, characterized by, Include: The body structure, both sides of the body structure are equipped with fixed plate one (3), the front and rear ends of the body structure are equipped with fixed plate two, both ends of the fixed plate one (3) are provided with mounting plate, the body structure includes pulse plate one (5), pulse plate two (4), pulse plate three (2) and pulse plate four (1), the upper end of the pulse plate one (5) is provided with the pulse plate two (4), the upper end of the pulse plate two (4) is provided with the pulse plate three (2), the upper end of the pulse plate three (2) is provided with the pulse plate four (1), one side of the pulse plate three (2) is provided with tungsten wire mesh (10), one side of the pulse plate one (5) is provided with high voltage pulse source, the pulse plate three (2) and the pulse plate four (1) are provided with reverse high voltage pulse source; One side of the body structure is provided with an inlet, and the other side of the body structure is provided with an outlet.

2. A time-of-flight mass selector structure according to claim 1, characterized in that: The mounting plate includes mounting main plate (6) and mounting vice plate (7), both ends of the fixed plate one (3) are provided with the mounting main plate (6), one side of the mounting main plate (6) is connected with the mounting vice plate (7), the mounting main plate (6) and the mounting vice plate (7) constitute L-shaped structure.

3. A time-of-flight mass selector structure according to claim 2, wherein: One side of the mounting vice plate (7) is provided with insulation part one (8).

4. A time-of-flight mass selector structure according to claim 3, wherein: The mounting vice plate (7) is provided with insulation part two (9).

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