The excitation source in the LIBS spectrometer is a Nd:YAG laser, Litron NANO S 130-10 Q-Switched, operating at its 2nd harmonic (532 nm), emitting 7ns pulses at 1Hz repetition rate. The pulsed laser beam is focused on the sample with a glass lens and the atomic emissions from the generated plasma plume are collected with glass lens to an optic fiber. All the measurements are taken at 5 cm in an angle of 45°. The spectral analysis and the detection of plasma emission are performed using a Czerny-Turner spectrograph, Andor SR-163, with adjustable slit and holographic grating of 2400 grooves mm-1, coupled to an ICCD camera, Andor iStar DH720 (1024 x 1024 pixel array, 26 x 26 μm pixel size) with temporal resolution. The spectra are collected with a delay time of 100 ns and a temporal observation window of 500 μs and with a spectra resolution of 0,26nm.

Report
data interpretation
spectra in *.asc

Micro-destructive (removal or permanent alteration of very small, inconspicuous portions)

Andor

SR-163

small spot ~0,125 mm2