An ultrathin sample auxiliary clamping device for glow discharge mass spectrometer

Abstract

The utility model discloses a kind of ultra-thin sample auxiliary clamping devices for glow discharge mass spectrometer, belong to the technical field of glow discharge mass spectrometer test, the device includes block main body, the bottom of the block main body is flat bottom surface, for being contacted with ultra-thin sample surface, the top surface of the block main body is equipped with recess, for accommodating and positioning the original set of pressure tool pressure head of glow discharge mass spectrometer, the block main body is arranged between ultra-thin sample and pressure tool pressure head, pass through flat bottom surface even transmission pressure, and pass through recess and pressure tool pressure head cooperation to realize stable clamping. The utility model solves the stress deformation in the test of ultra-thin sample, clamping is not stable, breakdown pollution and pressure tool pressure head damage problem, improves detection precision, prolongs the life of equipment.

Description

Technical Field

[0001] This utility model relates to the field of glow discharge mass spectrometry testing technology, and in particular to an ultra-thin sample auxiliary clamping device for glow discharge mass spectrometry. Background Technology

[0002] Glow discharge mass spectrometry is currently recognized as one of the most effective methods for solid trace analysis. The Element GD (Plus) glow discharge mass spectrometer manufactured by Thermo Fisher Scientific in the United States is widely used in my country. This model of glow discharge mass spectrometer has strict requirements on sample thickness. When directly clamping ultrathin samples with a thickness of less than 0.5 mm, the clamping device is prone to deformation and slippage due to stress concentration. Furthermore, after the sample breaks down, the exposed metal clamping head can introduce contamination and damage the equipment. Therefore, there is an urgent need for a reliable and effective clamping device to solve the problems of unstable clamping of ultrathin samples, local stress concentration, breakdown contamination, and clamping device damage. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides an ultra-thin sample auxiliary clamping device for glow discharge mass spectrometers.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] An auxiliary clamping device for ultrathin samples in a glow discharge mass spectrometer includes a block-shaped main body. The bottom of the block-shaped main body is a flat bottom surface for contacting the surface of the ultrathin sample. The top surface of the block-shaped main body is provided with a groove for accommodating and positioning the original pressure head of the glow discharge mass spectrometer. The block-shaped main body is positioned between the ultrathin sample and the pressure head, and the pressure is uniformly transmitted through the flat bottom surface and stably clamped by cooperating with the pressure head through the groove.

[0006] Furthermore, the groove has a circular structure.

[0007] Furthermore, the diameter of the circular structure is 40-42 mm. Furthermore, the depth of the groove is 5-10 mm.

[0008] Furthermore, the thickness of the block-shaped body is 20-25 mm.

[0009] Furthermore, the block-shaped main body is a high-purity insulating material.

[0010] Furthermore, the high-purity insulating material is alumina ceramic with a purity of ≥99.95%.

[0011] The beneficial effects of this utility model are:

[0012] 1. This utility model achieves uniform pressure transmission and stable sample clamping by having the flat bottom surface of the block-shaped main body contact the ultrathin sample, and the groove accommodates and positions the pressure head of the pressure fixture. This effectively avoids deformation and damage to the ultrathin sample caused by stress concentration during the test, and improves the accuracy and reliability of the test.

[0013] 2. The groove is designed as a circular structure, which can better fit the original circular pressure head of the glow discharge mass spectrometer, realize the precise positioning of the pressure head, prevent the pressure head from sliding or deviating during use, and further improve the stability of clamping.

[0014] 3. The diameter of the circular structure is set to 40-42 mm, which can match the size of the pressure head commonly used in glow discharge mass spectrometers, ensuring that the pressure head can be stably placed in the groove;

[0015] 4. The depth of the groove is set to 5-10 mm, which can effectively fix the pressure head of the press and prevent it from moving laterally during use, and also avoid the groove being too deep and affecting the overall strength of the block body, thus enhancing the stability and practicality of the device.

[0016] 5. The thickness of the block body is set to 20-25 mm, which ensures that the block body has sufficient mechanical strength while taking into account the convenience of operation, making it convenient for users to pick up and put down samples and clamping devices, thus improving operational efficiency.

[0017] 6. The block body is made of high-purity insulating material, which can effectively avoid the introduction of impurity elements, prevent contamination caused by sample breakdown, protect the pressure head from sputtering damage, extend the service life of the equipment, and ensure the accuracy of test results.

[0018] 7. The block body is made of alumina ceramic with a purity of ≥99.95%. Its ultra-high purity can avoid the introduction of impurity elements during the test. Its high hardness can effectively protect the pressure head from damage. Its excellent insulation performance blocks the discharge path after sample breakdown and prevents the metal pressure head from being exposed and causing contamination. Attached Figure Description

[0019] Figure 1 This is a perspective view of the device of this utility model;

[0020] Figure 2 This is a cross-sectional view of the device of this utility model;

[0021] Figure 3 This is a top view of the device of this utility model;

[0022] Figure 4 This is a schematic diagram of the overall structure of the device of this utility model when it is used in conjunction with the sample cell.

[0023] In the attached diagram: 1. Block-shaped main body; 2. Bottom surface; 3. Groove; 4. Sample; 5. Sample pool; 6. Pore; 7. Press head. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] like Figures 1-4 As shown, an ultrathin sample auxiliary clamping device for a glow discharge mass spectrometer includes a block-shaped body 1, which is made of a high-purity insulating material. In this embodiment, the high-purity insulating material is preferably alumina ceramic with a purity ≥ 99.95%. Alumina ceramic has excellent electrical insulation, high purity to avoid introducing impurity elements, good vacuum compatibility and low gas escape rate to adapt to the high vacuum environment of the mass spectrometer, sufficient mechanical strength to withstand clamping pressure, good sputtering resistance and heat resistance. Other high-purity insulating materials that meet the above performance requirements can also be selected.

[0026] The block-shaped body 1 has a flat and smooth bottom surface 2. This bottom surface 2 directly contacts the upper surface of the ultrathin sample 4 to be tested during use. The flat bottom surface 2 increases the contact area with the ultrathin sample 4, evenly distributing the pressure from the pressure fixture onto the ultrathin sample 4, thereby avoiding sample deformation or damage due to stress concentration, and ensuring that the sample fits tightly against the sample stage of the sample cell 5.

[0027] The top surface of the block-shaped main body 1 is provided with a groove 3. In this embodiment, the groove 3 is a circular groove, and its shape and size are designed to accommodate and position the pressure head 7 of the sample cell originally provided with the glow discharge mass spectrometer. Specifically, the diameter of the pressure head of the Element GD (Plus) type glow discharge mass spectrometer is usually about 40 mm, and the diameter of the circular groove 3 is preferably 40-42 mm to ensure that the pressure head 7 can be stably placed in the groove 3. The depth of the circular groove 3 is preferably 5-10 mm, which is sufficient to effectively position the pressure head 7 and prevent it from sliding laterally during use, while not being too deep to affect the stability of the overall clamping structure or increase manufacturing costs.

[0028] The overall thickness of the block body 1, i.e., the distance from the bottom surface 2 to the top surface where the groove is not cut, is preferably 20-25 mm. This thickness ensures that the block body 1 has sufficient mechanical strength and insulation properties, while also facilitating handling by the operator.

[0029] In practical application, the present invention is first used to place the ultrathin sample 4 to be tested onto the pore 6 in the middle of the sample cell 5 of the glow discharge mass spectrometer. Then, the block-shaped body 1 of the auxiliary clamping device of the present invention is placed on the upper surface of the ultrathin sample 4, ensuring its flat bottom surface 2 is in close contact with the sample 4. Finally, the original pressure head 7 of the instrument is aligned and placed into the circular groove 3 on the top surface of the block-shaped body 1, and appropriate pressure is applied through the instrument's own clamping mechanism.

[0030] The pressure from the clamping head first acts on the bottom of the circular groove 3 of the block body 1, then is transmitted through the block body 1 to its flat bottom surface 2, and finally evenly applied to the ultrathin sample 4. The cooperation between the circular groove 3 and the clamping head 7 ensures stable alignment of the entire clamping system, preventing slippage or misalignment that might occur if the clamping head 7 directly contacts the sample. The flat bottom surface 2 increases the contact area with the sample, effectively dispersing the pressure and avoiding localized deformation of the ultrathin sample 4.

[0031] Since the block body 1 is made of high-purity insulating material, when the ultrathin sample 4 is broken down during use, the discharge area will be interrupted due to the insulation of the block body 1. The discharge will not be able to continue to the conductive metal pressure head 7, thereby avoiding elemental contamination and background interference to the analysis results, protecting the pressure head from sputtering damage, and extending its service life.

[0032] In summary, the auxiliary clamping device of this utility model has a simple structure and reasonable design, which effectively solves the problems encountered in the prior art when performing glow discharge mass spectrometry analysis on ultrathin samples, such as unstable clamping, sample deformation, contamination after breakdown, and damage to the clamping head. It can achieve stable and accurate detection of ultrathin samples with a thickness of less than 0.5 mm. Therefore, the device has good practicality.

Claims

1. An ultrathin sample auxiliary clamping device for a glow discharge mass spectrometer, characterized in that: The instrument includes a block-shaped body (1), the bottom of which is a flat bottom surface (2) for contacting the surface of the ultrathin sample (4). The top surface of the block-shaped body (1) is provided with a groove (3) for accommodating and positioning the original pressure head (7) of the glow discharge mass spectrometer. The block-shaped body (1) is positioned between the ultrathin sample (4) and the pressure head (7), and the pressure is uniformly transmitted through the flat bottom surface (2), and stable clamping is achieved through the groove (3) and the pressure head (7).

2. The ultrathin sample auxiliary clamping device for glow discharge mass spectrometer according to claim 1, characterized in that: The groove (3) has a circular structure.

3. The ultrathin sample auxiliary clamping device for glow discharge mass spectrometer according to claim 2, characterized in that: The diameter of the circular structure is 40-42 mm.

4. The ultrathin sample auxiliary clamping device for glow discharge mass spectrometer according to claim 1, characterized in that: The depth of the groove (3) is 5-10 mm.

5. The ultrathin sample auxiliary clamping device for glow discharge mass spectrometer according to claim 1, characterized in that: The thickness of the block body (1) is 20-25 mm.

6. The ultrathin sample auxiliary clamping device for glow discharge mass spectrometer according to claim 1, characterized in that: The block-shaped main body (1) is a high-purity insulating material.

7. The ultrathin sample auxiliary clamping device for glow discharge mass spectrometer according to claim 6, characterized in that: The high-purity insulating material is alumina ceramic with a purity of ≥99.95%.

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