Double-pulse LIBS in water with up to 600 bar hydrostatic pressure and up to 150 mJ energy of each pulse

Double-pulse laser induced breakdown spectroscopy (LIBS) measurements in water with up to 600 bar hydrostatic pressure and 150 mJ energy of each pulse were done to select a setup which promote separated spectral lines in the observed plasma emission even at elevated pressures, where line broadening until loss of the most spectral information can occur. For this a compact spectrometer und a Czerny-Turner spectrometer, both fiber-based, has been applied to investigate the dependence of the emitted radiation on different parameters and hydrostatic pressure. The spectral data with an exposure time of 100 ns was measured with a Roper Acton Spectra Pro 500i with connected PI-MAX2 camera, whereas the spectral data with an exposure time of 1 ms was measured with an Avantes AvaSpec ULS17502F-USB2 compact spectrometer.