TY - JOUR A1 - Asgill, Michael E. A1 - Groh, S. A1 - Niemax, Kay A1 - Hahn, D.W. T1 - The use of multi-element aerosol particles for determining temporal variations in temperature and electron density in laser-induced plasmas in support of quantitative laser-induced breakdown spectroscopy JF - Spectrochimica acta B N2 - Quantitative laser-induced breakdown spectroscopy (LIBS) analysis operates on the assumption that the sample is completely dissociated and diffused within the highly energetic plasma on time-scales of analyte analysis, resulting in analyte emission ideally at the bulk plasma temperature and a signal that is linear with analyte mass concentration. However, recent studies focusing on aerosol analysis have found the heat and mass diffusion rates within laser-induced plasmas to be finite, resulting in particle-rich, locally perturbed areas within the hot bulk plasma. The goal of this study is to observe any related plasma differences, by calculating the bulk and local (i.e. analyte rich regions) plasma temperatures and electron density, to better understand the time frame of equilibrium between the local and bulk plasma properties. This study also seeks to determine whether the presence of large quantities of a matrix element can significantly alter the local plasma conditions, thereby generating matrix effects. We report the temporal profiles of particle-derived species, adding additional insight into the effect of local perturbation of plasma properties, with the conclusion that significant plasma residence (tens of microseconds) is necessary to minimize such effects. KW - Laser-induced breakdown spectroscopy KW - LIBS KW - Matrix effects KW - Aerosol analysis PY - 2015 DO - https://doi.org/10.1016/j.sab.2015.04.005 SN - 0584-8547 SN - 0038-6987 VL - 109 SP - 1 EP - 7 PB - Elsevier CY - Amsterdam AN - OPUS4-33733 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -