Scattering of electromagnetic waves by charged spheres and some physical consequences

Klačka, J.; Kocifaj, Miroslav

doi:10.1016/j.jqsrt.2007.01.016

Cited by 94 publications

(54 citation statements)

References 15 publications

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“…Application of boundary conditions represented by Eq. (4) to the electric and magnetic fields finally yields for the scattering coefficients a n and b n (see [3]):…”

Section: Scattering Coefficientsmentioning

confidence: 99%

“…(9) reduces to Eq. (26) given in [3] for the special case µ 1 = µ 0 (used also by Rosenkrantz and Arnon [9]). The conventional formulae for the Mie theory for electrically neutral particles follows from Eq.…”

Section: Scattering Coefficientsmentioning

confidence: 99%

“…Much later Bohren and Hunt [2] addressed the effect of surface charge on the optical features of small homogeneous spherules. Just recently Klačka and Kocifaj [3] partially improved the physics of this phenomena and demonstrated the optical consequences on set of examples assuming charged and electrically neutral (Mie) particles. Now, some extension to the theory is suggested.…”

Section: Introductionmentioning

confidence: 99%

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On the Scattering of Electromagnetic Waves by a Charged Sphere

Klačka¹,

Kocifaj²

2010

PIER

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Abstract-Scattering of electromagnetic radiation by a charged homogeneous spherical particle/body is treated. Theoretical solution represents a generalization of the Mie's scattering theory for electrically neutral sphere. It is shown that classical and quantum physics approaches may lead to different conclusions, as documented by numerical computations assuming various permeabilities, refractive indices, surface charges, temperatures, and other physical parameters of the spherical particles. Two discrete wavelengths (5 µm and 1 mm) of the incident radiation are considered. Optical properties of charged particles composed of absorbing and slightly absorbing materials can essentially differ. Especially, the resonance peaks typically occur when imaginary part of particle refractive index is low. The relative permeability of a material may differ from unity at large wavelengths, e.g., in microwave region. Basically, the relative permeability appears to be less important factor than the surface charge. However, the permeability can influence the scattering and extinction efficiencies, as well as the backscattering features of small particles, under some conditions.

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“…Application of boundary conditions represented by Eq. (4) to the electric and magnetic fields finally yields for the scattering coefficients a n and b n (see [3]):…”

Section: Scattering Coefficientsmentioning

confidence: 99%

Section: Scattering Coefficientsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

On the Scattering of Electromagnetic Waves by a Charged Sphere

Klačka¹,

Kocifaj²

2010

PIER

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“…Недав-ние уточнения приближения Релея для однородных эллипсоидов приводятся, например, в [7]. Приближение было распространено на ансамбли шаров [8,9], а также сформулировано для заряженных шаров [10,11] и ан-самблей заряженных шаров [12].…”

Section: Introductionunclassified

Эллипсоидальная Модель Для Малых Многослойных Частиц

Фарафонов¹,

Устимов²,

Ильин³

et al. 2018

Журнал Технической Физики

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Поступила в редакцию 22.09.2017 г.В настоящей работе построена эллипсоидальная модель для малых слоистых несферических частиц, предложены способы построения " эффективных" многослойных эллипсоидов, светорассеивающие свойства которых были бы близки к свойствам исходных частиц. Для осесимметричных частиц речь идет о вытянутых или сплюснутых сфероидах (эллипсоидах вращения). Численные расчеты поляризуемости и сечений рассеяния малых слоистых несферических частиц, в том числе неконфокальных (подобных) сфероидов, чебышевских частиц и псевдосфероидов, проводятся разными приближенными и строгими методами. К приближенным подходам относится использование эллипсоидальной модели, в рамках которой поляризуемость слоистой частицы определяется двумя способами. В первом случае она вычисляется в приближении конфокальных сфероидов (CEA), а во втором -как линейная комбинация поляризуемостей вложенных сфероидов пропорционально объемам слоев (LVA). Из строгих методов применяются ЕВСМ (метод расширенных граничных условий) и обобщенный SVM (метод разделения переменных). На основании сравнения результатов, полученных с помощью строгих и приближенных подходов, обсуждены недостатки и достоинства последних.

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“…Some theoretical models and various numerical techniques have been found to predict the optical properties of particles [3,4], but most of them have neglected the effects of the environment factors, except for the environmental humidity [5] and the adhesion of mineral and soot aerosols [6,7]. However, most particles of interest in astrophysics and atmospheric sciences are charged [8][9][10][11][12], and those electrified particles not only enhance the attenuation of incident EM wave [13][14][15][16][17][18][19][20], but also generate a strong Electrostatic field (signed as E-field for short). For example, the charged sands or dusts can produce a strong E-field in the air [21][22][23][24][25][26], and the maximal intensity can reach up to 200 kV/m [27,28].…”

Section: Introductionmentioning

confidence: 99%