Study On The Radiation Of Laser-Induced Breakdown Spectroscopy By Hight-Energy Laser

In order to be widely used in trace element determination,film deposition,Laser-Induced Breakdown Spectroscopy technique has been studied.There are alsosome problems such as feeble line,low S/B ratio in laser trace elementdetermination.It is reported that the influence of ambient gas is different fordifferent laser or sample.In this paper, the effects of Argon atmosphere at high pressure on theradiation of the plasma induced by a high energy neodymium glass laser (～25J)were studied.Follow are the details.1. Metal plasma: Both the line intensity , width , backgroud ,signal-to-background ratio of the emission spectra and the electrontemperature,electron density of the plasma was researched in Ar atmosphere atdifferent pressure. In addition spatially resolved electron temperature wasmeasured in Ar atmosphere. The effects of Argon atmosphere at high pressure isexplained by "confined effect".2. Soil plasma: The result is that The effects of Argon atmosphere for soilplasma is strongly. Both the shape of plasma,the quality of line,the ablatedmass of the sample was researched. Electron temperature of plasma was measuredin 104 scale and enhances with the increase of the gas pressure. In addition,it is proved that the effects of high pressure atmosphere is useful widely bythe spectra of tile,cement and marble measured.3. Quantitative analysis : The quantitate of Fe and Ti in soil were measuredby internal standard method. The results show that RSD of quantitative analysisof them are respectively 4.206% and 11.01%,and relative error of average ofanalyses of them are less than 8.4% and 23%.This shows that there is a good linearrelation between the spectral intensity and the elemental density.