An approximate method for calculating the electrostatic potential due to external charges in systems with interfaces, involving components with spatially dispersive permittivities is developed. The method can be applied to systems with an arbitrary type of nonlocal dielectric response of the components and for a broad class of interfaces, separating the 'quasi-uniform' regions. All the solutions are obtained in the form of integrals from functions which are known and functions which can be determined from a Fredholm integral equation of the second kind. For a set of systems, its kernel provides an easy transformation of this equation to a simple differential one, so that the solutions are obtained in an analytical form. As an example, the contact of two media at a plane interface is considered.
The effect of penetration of an electric field into the metal, electrolyte solution, or other plasmalike medium (PLM) on the image-potential energy in a dielectric adjacent to such a PlAI is studied. The asymptotics of classical attraction of a test charge t o an "impenetrable metal surface" at large distances and of effective interaction with "dielectric-dielectric interface" a t small distances are found. The latter results in a repulsion of a charge from the boundary, when the dielectric constant of the background medium, in which plasma particles are dissolved, is smaller than the permittivity of the dielectric. A minimum of the image-potential curve is situated between the "repulsive" and "attractive" limiting branches. Thus an adsorption minimum is predicted within the scope of purely electrostatic considerations, the value of the "desorption energy" being estimated.MccaefiosaH a@#eri~ npoHmwoueHm a n e~~p~~s e c~o r o IIOJIH B MeTanjI, pacTuop ~m a n e~~p m e , rpaHnsaweM c TaKoro
The effect of spatial dispersion of the permittivity of an electrolyte solution on the character of image forces W ( a ) near a metal electrode is investigated. The effect of penetration o f an electric field into the metal is taken into account. The asymptotic expressions obtained for W(a) show that in llighly dilute electrolyte solutions the charge in addition to usual attraction encounters an effective repulsion in two distance regions from the metal, so that the image of W(a) has an essentially non -monotonic form. For a more concentrated solution, the image of W(a) is modified and may take D form corresponding to a monotonic repulsion of the charge from the interface. pacTBopa 3~1 e K~p o n~~a Ha XapaKTep CMJI m 0 6 p a w e~m W ( a ) , B~J I H~H MeTanamecKoro nOJIyYeHHble acmnToTwIecKMe BbipaweHwi W ( a ) n o~a m~a m~, YTO B cmbHo pa36asne~-~CCJleAOBaHO BJIRRHMe npOCTpaHCTBeHHO%b AIlCIIepCHM AM3JIeKTptlqeCKOfi npO€I€ ¶~aeMOCTIl 3JIeKTpOAa. YYMTblBaeTCH 3$@eKT IIpOHMKHOBeHIlH 3JlIeKTPH9eCHOrO nOJIR B MeTaJIJl. HbIX PaCTBOpaX BJIeKTPOJIMTOB, KpOMe npHEblYHOr0 IIpMTHWeHHR, Sapfin RCnbITMBaeT 3#@eKTHBHOe OTTaJIKRBaHMe B AByX o 6 n a c~~x paCCTOHHIlfi OT MeTaJIJIa, TaR YTO llpO@IlJlb w(Q) HMeeT CyIUeCTBeHHO HeMOHOTOHHbl X BMA. &IR 6onee KOHLl(?HTPUPOBaHHblX PaCT-BOPOB, npO@iJIb W(Cl), H3MeHeH H MOmeT IIepeXOAIlTb H BHAY, COOTBeTCTBYlOweMY MOHO-TOHHOMY OTTaJIKMBaHHIO 3apRna OT rpaHHUbI pa3AeJIa. -1) Kirova street 25, 142450 Staraii, Kupavna, Moscow region, USSR. 2) Defective properties of the contact are neglected in this model. 6 physica (b) 120/1
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