Laser Induced Breakdown Spectroscopy Technique And Its Application In Minerals Elemental Analysis

Elemental analysis based on the emission from plasma generated by focusing a powerful laser beam on any material surface is known as laser-induced breakdown spectroscopy (LIBS). Laser-induced breakdown spectroscopy technique is beginning to emerge as important tools for chemical analysis because of the prospect they offer for the selective, minimally destructive, lack of pretreatment of the material, the speed of analysis, and high sensitivity detection and analysis of solid, liquid, aerosol, and gaseous materials in real time in situ. The main parameters affecting the performance of LIBS results are as follows: laser intensity, excitation wavelength, laser pulse duration, physical and chemical characteristics of the target material and its surface conditions, and the atmosphere.The detailed summarization of the background and research in LIBS during the past 15 years is provided in this paper. A whole system of LIBS research has been constructed and evaluated independently. We investigated the optimum experimental condition of LIBS in elemental analysis. We also researched the factors which will affect the LIBS signals, such as laser angle of incidence, rotary target, laser energy intensity and time delay. Some characteristic emission lines of neutral atoms in excited states are identified. We have examined some coal mineral samples and cuprum mineral samples, and confirmed that LIBS was an efficacious measure for examining coal impurity and for chemical examining on geology. We also have found out the best spectrum for some elements examining. On that base we studied quantificational analyze some elements by demarcate the element in itself.