Confinement of Laser Plasma by Shock Waves for Increasing Signal Intensity in Spectrochemical Determination of Trace Elements in Oresстатья
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Дата последнего поиска статьи во внешних источниках: 10 апреля 2018 г.
Аннотация:We have studied the confinement of laser plasma by shock waves (also known as "spatial confinement") induced on an ore sample, as exemplified by changes in the intensity of Ag I 328.07 nm and Au I 267.60 nm emission lines. It is established that the maximum increase in intensity of these lines is observed at 2- to 2.5-μs delay, which corresponds to an increase in the plasma temperature up to 5900 K. The signalto-noise ratio upon the spatial confinement of plasma is somewhat reduced, but the overall growth of signal intensity provides increase in the sensitivity of laser-induced breakdown spectrometry for determining trace elements in ores.