Dynamics of silicon plume generated by laser ablation and its chemical reaction

Chemical reaction of laser-ablated silicon particles with oxygen gas diluted with a helium buffer gas is found by means of soft X-ray absorption spectroscopy. In order to make clear the dynamics of silicon laser plume and the mechanism of the chemical reaction, we measured time-resolved spatial distribution of light emission from the laser-ablated particles as well as time- and space-resolved emission spectra.