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Thermally excited multiplet states in flame coal

机译：火焰煤中的热激发多重态

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摘要

Paramagnetic centres of Polish flame coal with a carbon content of 70.8 wt/100 were studied by electron paramagnetic spectroscopy at X- band (9.3 GHz). The influence of the measuring temperature on its two-component EPR spectrum was analysed. The measurements of line intensity and linewidth were carried out in the temperature range 100-300 K. It was found that the broad Lorentz line present in the EPR spectrum of the studied coal is responsible for temperature dependence of integral intensity which does not fulfil the Curie law. This proves the existence of thermally excited multiplet states in flame coal. Paramagnetic centres related to the narrow Lorentz line in flame coal obey the Curie law.
机译：通过X波段（9.3 GHz）的电子顺磁光谱研究了碳含量为70.8 wt / 100的波兰火焰煤的顺磁中心。分析了测量温度对其两组分EPR谱的影响。线强度和线宽的测量是在100-300 K的温度范围内进行的。发现煤的EPR谱中存在的宽Lorentz线是积分强度对温度的依赖性所致，不能满足居里曲线法。这证明了火焰煤中存在热激发多重态。与火焰煤中狭窄的洛伦兹线有关的顺磁中心服从居里定律。

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