Infrared light extinction by charged dielectric core-coat particles
Infrared light extinction by charged dielectric core-coat particles
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DOI：
10.1140/epjd/e2014-50009-7
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发表时间：
2014-01
期刊：
影响因子：
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通讯作者：
E. Thiessen;R. L. Heinisch;F. Bronold;H. Fehske
中科院分区：
文献类型：
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作者：
E. Thiessen;R. L. Heinisch;F. Bronold;H. Fehske
我们研究了过剩电子对具有核涂层结构的介质粒子红外消光的影响，并提出将其用于尘埃等离子体中粒子电荷的光学测量。这些粒子由一个带负电的内核和一个带正电子亲和力的外层组成。磁芯和涂层都会产生强烈的横向光学声子共振，导致红外的反常光散射。由于电子亲和力的径向分布，电子聚集在涂层区域，使得这类粒子的红外消光对电荷非常敏感，特别是由于核芯-涂层结构引起的共振造成的消光。这种共振的最大值在远红外线，并对在普通尘埃实验室等离子体中可实现的粒子电荷做出反应。
We study the effect of surplus electrons on the infrared extinction of dielectric particles with a core-coat structure and propose to use it for an optical measurement of the particle charge in a dusty plasma. The particles consist of an inner core with negative and an outer coat with positive electron affinity. Both the core and the coat give rise to strong transverse optical phonon resonances, leading to anomalous light scattering in the infrared. Due to the radial profile of the electron affinity electrons accumulate in the coat region making the infrared extinction of this type of particles very charge-sensitive, in particular, the extinction due to a resonance arising solely due to the core-coat structure. The maximum of this resonance is in the far-infrared and responds to particle charges realizable in ordinary dusty laboratory plasmas.