Screening length in dusty plasma crystals

31st International Conference on Equations of State for Matter

Nikolaev, V.S.^1,2 ; Timofeev, A.V.^1,2

Joint Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya 13 Bldg 2, Moscow

125412, Russia^1

Moscow Institute of Physics and Technology, Institutskiy Pereulok 9, Dolgoprudny, Moscow Region

141700, Russia^2

关键词: Dusty plasma crystals;    Equilibrium equation;    Functional forms;    Interaction potentials;    Interparticle distances;    Interparticle potential;    Ion temperature;    Screening lengths;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/774/1/012172/pdf
DOI  :  10.1088/1742-6596/774/1/012172

来源: IOP

【 摘 要 】

Particles interaction and value of the screening length in dusty plasma systems are of great interest in dusty plasma area. Three inter-particle potentials (Debye potential, Gurevich potential and interaction potential in the weakly collisional regime) are used to solve equilibrium equations for two dusty particles suspended in a parabolic trap. The inter-particle distance dependence on screening length, trap parameter and particle charge is obtained. The functional form of inter-particle distance dependence on ion temperature is investigated and compared with experimental data at 200-300 K in order to test used potentials applicability to dusty plasma systems at room temperatures. The preference is given to the Yukawa-type potential including effective values of particle charge and screening length. The estimated effective value of the screening length is 5-15 times larger than the Debye length.