Substance detection method through optical spectrometry-mass spectrometry combination under planet open environment

Abstract

The invention discloses a substance detection method through optical spectrometry-mass spectrometry combination under planet open environment. The method is realized by a combination substance detection system, and the method comprises five steps of micro-area LIBS crude analysis, LIBS laser desorption under the planet open environment, ion particle aerosol transportion, MS fine analysis and optical spectrometry-mass spectrometry information fusion, and micro-area optical spectrometry-mass spectrometry analysis. The substance detection method has the following beneficial effects that planet atmosphere is used as carrier gas, and plasma particles induced by a LIBS laser is efficiently transmitted to MS for analysis with siphon effect of capillary; in a mass spectrum module, a time-of-flightmass spectrometer structure is employed, and disadvantages of requirement of auxiliary gas for ICP is avoided, a spectrometer employs combination of a CT structure and an ICCD detector, a weak femtosecond LIBS signal can be detected, and reuse requirement of optical spectrometry-mass spectrometry of a femtosecond laser device can be satisfied.

Description

technical field [0001] The invention relates to a material detection method, in particular to a material detection method using LIBS combined with MS optical mass spectrometry, which is suitable for material detection in the open environment of deep space detection of planets, and belongs to the field of in-situ detection of planets. Background technique [0002] So far, the technology of mass spectrometry detachment with laser is mainly LA-ICP-MS, that is, laser ablation (laserablation, LA) inductively coupled plasma mass spectrometry, laser is used for detachment and stripping, inductively coupled plasma mass spectrometry (inductively coupled plasma mass spectrometry) , ie ICP) for ionization, mass spectrometry (mass spectrometry, ie MS) for particle analysis. This technology is only in a closed laboratory environment, using a specially manufactured sample delivery chamber to efficiently send the laser-desorbed particles to the mass spectrometer for analysis. Using the LA...

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Problems solved by technology

[0004] Secondly, the ICP in ICP-MS adopts the method of arc heating and inert gas delivery, which requires high pressure and auxiliary gas cylinders, which is difficult to meet the needs of deep space planetary exploration. Therefore, ICP-MS is not suitable for mass spectrometry analysis;

[0005] Furthermore, the adoption of high repetition frequency deep ultraviolet and femtosecond laser sources can effectively reduce the fractionation effect of mass spectrometry, make the ablation holes smooth and detach particles smaller and more uniform, which is an excellent laser source for detachment; but for LIBS In terms of ultra-short femtosecond pulses, the particles ablated at high temperature have no thermal effect of heat accumulation, which makes the LIBS signal much weaker than that of conventional nanosecond lasers. In addition, high repetition rate lasers are not suitable for LIBS;

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