Stoichiometric Analysis of Ammonium Nitrate and Ammonium Perchlorate with Nanosecond Laser Induced Breakdown Spectroscopy

摘要

We present our results on the stoichiometric analysis of ammonium nitrate (AN) and ammonium Perchlorate ( AP) studied using laser induced breakdown spectroscopy (LIBS) with nanosecond pulses. The LIBS spectra collected for AP and AN, without any gating and using a high resolution spectrometer, exhibited characteristic lines corresponding to O, N, H, C, and K. The Oxygen line at 777.38 nm and three Nitrogen lines (N_1, N_2, N_3) at 742.54 nm, 744.64 nm, 747.12 nm were used for evaluating the Oxygen/Nitrogen ratios. The intensities were calculated using area under the peaks and normalized to their respective transition probabilities and statistical weights. The O/N_1 ratios estimated from the LIBS spectra were ～4.94 and ～5.11 for AP and O/N_3 ratios were ～1.64 and ～1.47 for AN obtained from two independent measurements. The intensity ratios show good agreement with the actual stoichiometric ratios - four for AP and one for AN.