Water analysis by laser-induced shock wave plasma spectroscopy using re-crystallized KBr powder confined in a cylindrical tube

It has been demonstrated that shock wave plasma is produced even for a powder sample when a Q-sw Nd:YAG laser beam was focused at a reduced pressure on the surface of powder confined in a small vertical hole. KBr powder was dissolved in the water to be analyzed, and the water was boiled. The re-crystallized KBr, which consisted of trapped impurities present in the water, was contained in the hole to be irradiated by the laser pulse at low pressure.