Polarization-resolved laser-induced breakdown spectroscopy based on a temporal investigation of polarized Cu plasma emission is presented by a gated detector with a width of 10 ns and a delay time range of 10 ns–2 µs. Polarization-resolved spectra show that the delay time plays a crucial role in plasma polarization for both continuum and discrete emissions. The polarization degree of continuum emission is shown to be stronger than the polarization degree of discrete emissions at delay times less than 500 ns, while this trend is inverse in a delay time range of 750 ns–1 µs. The mechanism for polarized continuum emission is proposed to have dynamic polarizability of a core, while the polarized discrete emission is driven by the interaction of the plasma with the surrounding environment. The latter may lead either to a deviation of plasma from local thermodynamic equilibrium or generation of self-magnetic fields.

中文翻译：

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铜的偏振分辨激光诱导击穿光谱的时间演化

基于偏振铜等离子体发射的时间研究的偏振分辨激光诱导击穿光谱由宽度为 10 ns 和延迟时间范围为 10 ns–2 µs 的门控检测器呈现。偏振分辨光谱表明，延迟时间在连续发射和离散发射的等离子体偏振中起着至关重要的作用。在延迟时间小于 500 ns 时，连续谱发射的极化程度比离散发射的极化程度强，而这种趋势在 750 ns–1 µs 的延迟时间范围内是相反的。提出了极化连续发射机制具有核心的动态极化率，而极化离散发射由等离子​​体与周围环境的相互作用驱动。