Van der Waals forces and spatial dispersion

A version of the Green’s functions theory of the Van der Waals forces which can be conveniently used in the presence of spatial dispersion is presented. The theory is based on the fluctuation-dissipation theorem and is valid for interacting bodies, separated by vacuum. Objections against theories accounting for the spatial dispersion are discussed.     

On the macroscopic theory of retarded Van der Waals forces

The Lifshitz formula for the retarded dispersion force between two dielectric media at zero temperature is derived by a simple macroscopic method.     

Non-local effects in the macroscopic theory of Van der Waals and adhesive forces

The role of deviations from perfect screening in the Van der Waals interaction between two metal half-spaces a distance d apart is analyzed for a simple model. The interaction energy which is finite for d → 0 includes asymptotic corrections to the well-known d^?2 law. These corrections lead to a reduction of the order of 30 to 40% of the interaction in the vicinity of equilibrium distances for particle adhesion.     

Van der Waals interaction of membranes

The van der Waals interaction of hydrocarbon films in water is calculated using the exact expression derived by Parsegian and Ninham. The results are compared to an often used approximation, which fails for this system due to the large difference between the static dielectric constants of hydrocarbons and water. For large membrane separations the correct value of the van der Waals interaction is about a hundred times larger than the approximate result. The consequences for predicting unbinding transitions and interpreting experiments are discussed.Dedicated to Prof. Herbert Wagner on the occasion of his 60th birthday     

Van der Waals forces and the weakening of multiparticle correlations in simple liquids and gases

The general theory of van der Waals forces is used to calculate the asymptotic form of the n-particle correlation function for a simple liquid for any interparticle distance that is much greater than the interatomic separation. It is shown that when n>2 the nonadditive nature of the long-range forces leads to conditions for the weakening of the correlation which are fundamentally different from those obtained from theories in which a pairwise potential is assumed for intermolecular interactions. A relationship is obtained between the asymptotic forms and the n-atom potential for the case of a tenuous gas.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 12, pp. 73–79, December, 1976.We wish to thank I. Z. Fisher and L. P. Pitaevskii for useful discussions of the work, and F. M. Kuni for a number of important comments.     

范德瓦尔斯方程的几点探析

分析了学生在范德瓦尔斯方程学习中容易产生误解或者忽视的几个重要问题,以加强学生对范德瓦尔斯方程的准确理解.     

Van der Waals interaction between spherical voids

The problem of calculating the non-retarded Van der Waals type of interaction between two spherical voids in an electron gas is presented from a new approach. The formulation is based on an integral equation for the self-induced density oscillations derived from a semi-classical treatment of the density-density response theory for inhomogeneous electron systems. The interaction energy between two identical voids is found to obey d^-6 law for large separation d between the voids, the law being determined by the dipolar plasma oscillations alone.     

Geometrothermodynamics of Van der Waals black hole

We study the geometrothermodynamics of a special asymptotically AdS black hole, i.e. Van der Waals \(\left( VdW\right) \) black hole, in the extended phase space where the negative cosmological constant \(\Lambda \) can be regarded as thermodynamic pressure. Analysing some special conditions of this black hole with geometrothermodynamical method, we find a good correlation with ordinary cases according to the state equation.     

Van der Waals Attraction of Hydrogen Atoms

Journal of Experimental and Theoretical Physics - The potential energy of attraction between hydrogen atoms spaced by distance R on the order of aB/α, where aB is the Bohr radius and α =...     

Effect of Van der Waals forces on the lattice dynamics and crystal structure of noble metals

The effect of Van der Waals forces on the lattice dynamics and crystal structure of noble metals has been studied in the formalism of Rehr, Zaremba and Kohn. When the contribution of these forces is included in the resonant model potential scheme, the phonon frequencies are lowered by 5–8% and the crystal structure is still found to be the observed one (f.c.c.) for noble metals.     

Van der Waals density functional for layered structures

To understand sparse systems, we must account for both strong local atom bonds and weak nonlocal van der Waals forces between atoms separated by empty space. A fully nonlocal functional form [Phys. Rev. B 62, 6997 (2000)]] of density-functional theory (DFT) is applied here to the layered systems graphite, boron nitride, and molybdenum sulfide to compute bond lengths, binding energies, and compressibilities. These key examples show that the DFT with the generalized-gradient approximation does not apply for calculating properties of sparse matter, while use of the fully nonlocal version appears to be one way to proceed.     

范德瓦耳斯和他的状态方程

在物理学发展史上，范德瓦耳斯对气—液流体系统做了开创性的研究工作，建立了人类历史上第一个既能反映气、液各相性质，又能描述相交和临界现象的状态方程。范德瓦耳斯的理论成就和研究方法对热力学、统计力学和低温物理学的发展产生了重要而深远的影响。文章系统探讨了范德瓦耳斯方程产生的历史背景、科学意义和局限性，讨论了范德瓦耳斯的理论和方法对当代物理学的启发意义。     

Van der Waals broadening of argon absorption lines

Van der Waals broadening coefficients for Ar absorption lines have been measured using the resonant Faraday effect. These coefficients have the values of 2·9 ± 0·8, 2·4 ± 0·3, 1·9 ± 0·2 (in units of 10^?20 cm^?1 ?cm^?3) for the lines 6965 Å, 7067 Å, 7635 Å and 8115 Å, respectively, respectively. The measured coefficients are in reasonable agreement with measurements carried out on Ar emission lines and with theoretical calculations.     

动力学压缩真空中的Van der Waals力

基于参数动力学过程产生的压缩效应,利用Millonni源理论方法研究了 动力学压缩真空中Van der Waals力的性质及其与真空压缩的关系。所得结果表明：Van der Waals力的性质依赖于真空压缩的程度;在一定的临界条件下,Van der Waals力由通常的 吸引性作用转化为排斥性作用。当压缩系数为零时,所得结果与通常文献完全一致。     

Self-diffusion in Kr compared with Van der Waals model

The predictions of the Van der Waals model for the self-diffusion in Kr are compared with the experimental results at 220 K and for 0.7ρ_c ? ρ ? 2.1ρ_c. The Van der Waals model fails to represent the Kr data while at the same temperature in the case of CH₄ this model works quite well for ρ_c < ρ ? 3ρ_c.