Femtosecond laser post-ionization mass spectrum apparatus

A femtosecond laser and ionized mass technology, applied in the field of mass spectrometry, which can solve problems such as quantitative analysis uncertainty

Inactive Publication Date: 2015-03-04
DALIAN NATIONALITIES UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although the isotope mass spectrometer combined with time-of-flight mass spectrometry has high analytical sensitivity, in fact, the efficiency of secondary ions generated in ...

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  • Femtosecond laser post-ionization mass spectrum apparatus
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  • Femtosecond laser post-ionization mass spectrum apparatus

Examples

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Embodiment 1

[0036] Test of ionization efficiency after secondary neutral particle of pure copper target:

[0037]This example is intended to illustrate the gain in ionization efficiency that can be produced by using the femtosecond laser as a post-ionization means in the present invention. In this embodiment, a nanosecond laser is used to sputter onto a pure copper target as the primary ionization source. The nanosecond laser has a frequency of 1 kilohertz, a pulse width of 20 nanoseconds, and a power of 5 watts. The secondary particles generated by sputtering are focused on the surface of the target by the nanosecond laser, and then post-ionized by the femtosecond laser. The frequency of the femtosecond laser is 1 kHz, the pulse width is 35-45 femtoseconds, and the energy is 3.5 watts. It is focused on the secondary particle through a 35 cm lens. The neutral particles among the secondary particles are ionized by the femtosecond laser to greatly improve the ionization efficiency of the ...

Embodiment 2

[0039] Nickel-cadmium alloy post-ionization test:

[0040] This example is intended to illustrate that the post-ionization device can perform post-ionization component analysis on a multi-element mixed system. In this embodiment, a nanosecond laser is still used as the primary ionization source. A femtosecond laser acts as a post-ionization source. The experimental conditions used were consistent with Example 1. image 3 Shown is the secondary neutral particle mass spectrum of the nickel-cadmium alloy obtained in the embodiment test. It can be clearly seen from the figure that the device can accurately and clearly perform post-ionization analysis on the composition of the alloy.

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Abstract

Disclosed in the invention is a femtosecond laser post-ionization mass spectrum apparatus comprising a vacuum chamber, a sample fixed bracket, a primary ionization source, a post-ionization source, an ion optics system and a flight time mass spectrum unit. An ion gun or laser is used as the primary ionization source to carry out sputtering on the solid surface; and during the primary ionization source sputtering process, a sample ion and a neutral particle can be generated, wherein the neutral-particle-based sputtering part enables the accuracy and the resolution ratio of the analysis result to be limited greatly. According to the invention, the femtosecond laser is used as the post-ionization means of the neutral particle, so that the ionization efficiency of the sample is substantially improved. And the sample ionization component is analyzed by using the flight time mass spectrum way.

Description

Technical field: [0001] The present invention relates to mass spectrometry techniques. More specifically, the present invention relates to secondary neutral particle mass spectrometry using femtosecond laser technology as a post-ionization method. Background technique: [0002] As a relatively universal analytical technique, mass spectrometry plays an important role in food safety testing, environmental pollution monitoring, geological mineral deposit composition analysis, life medicine and related drug research and development, and basic scientific research. Among them, due to its high sensitivity, high resolution, relatively simple structure, high cost performance, near-full-mass theoretical analysis range, and efficient and fast method of nearly simultaneous acquisition of species to be analyzed, time-of-flight mass spectrometry has become the current It is one of the most promising analytical methods in the field of mass spectrometry. The principle of time-of-flight ma...

Claims

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Application Information

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IPC IPC(8): H01J49/04H01J49/02H01J49/26
CPCH01J49/161
Inventor 王利刘本康
Owner DALIAN NATIONALITIES UNIVERSITY
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