Zur Theorie und Systematik der Molekularkr�fte

London, F.

doi:10.1007/bf01421741

Cited by 1,463 publications

(660 citation statements)

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“…In particular, for a ground-state atom in front of a planar magnetodielectric wall, equation (1) leads to (see, for example, [7,8,9,13,14])…”

Section: Casimir-polder Forcementioning

confidence: 99%

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Matter-screened Casimir force and Casimir–Polder force in planar structures

Raabe¹,

Welsch²

2005

J. Opt. B: Quantum Semiclass. Opt.

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Abstract. Using a recently developed theory of the Casimir force (Raabe C and Welsch D-G 2005 Phys. Rev. A 71 013814), we calculate the force that acts on a plate in front of a planar wall and the force that acts on the plate in the case where the plate is part of matter that fills the space in front of the wall. We show that in the limit of a dielectric plate whose permittivity is close to unity, the force obtained in the former case reduces to the ordinary, i.e., unscreened Casimir-Polder force acting on isolated atoms. In the latter case, the theory yields the Casimir-Polder force that is screened by the surrounding matter.

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“…In particular, for a ground-state atom in front of a planar magnetodielectric wall, equation (1) leads to (see, for example, [7,8,9,13,14])…”

Section: Casimir-polder Forcementioning

confidence: 99%

“…In the non-retarded (i.e., short-distance) limit, the potential associated with the force was first calculated by London [1,2]. The theory was later extended by Casimir and Polder [3] to allow for larger separations, where retardation effects cannot be disregarded.…”

Section: Introductionmentioning

confidence: 99%

Matter-screened Casimir force and Casimir–Polder force in planar structures

Raabe¹,

Welsch²

2005

J. Opt. B: Quantum Semiclass. Opt.

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“…If the distance R is smaller than the wavelength of atom transitions, the force is described by London formula 1 . If R is larger than the wavelength and the retardation effects are significant the force is described by the Casimir formula 2 , which was generalized later to arbitrary distances R by Casimir and Polder 3 .…”

Section: Introductionmentioning

confidence: 99%

van der Waals interaction of excited media

Sherkunov

2005

Phys. Rev. A

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Casimir interaction between two media of ground-state atoms is well described with the help of Lifshitz formula depending upon permittivity of media. We will show that this formula is in contradiction with experimental evidence for excited atoms.We calculate Casimir force between two atoms if one of them or both the atoms are excited. We use methods of quantum electrodynamics specially derived for the problem. It enables us to take into account excited-state radiation widths of atoms. Then we calculate the force between

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“…The Casimir-Polder interaction [1] between polarizable particles and a wall has received intense attention in recent decades. The theoretical framework for this interaction was worked out a long time ago [1][2][3][4][5], yet it remains a topic of great interest due to its many applications in biological, chemical, and atomic systems. For reviews, cf., e.g., [6][7][8].…”

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confidence: 99%

Sign of the Casimir-Polder interaction between atoms and oil-water interfaces: Subtle dependence on dielectric properties

et al. 2012

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We demonstrate that Casimir-Polder energies between noble gas atoms (dissolved in water) and oil-water interfaces are highly surface specific. Both repulsion (e.g., hexane) and attraction (e.g., glycerine and cyclodecane) is found with different oils. For several intermediate oils (e.g., hexadecane, decane, and cyclohexane) both attraction and repulsion can be found in the same system. Near these oil-water interfaces the interaction is repulsive in the nonretarded limit and turns attractive at larger distances as retardation becomes important. These highly surface specific interactions may have a role to play in biological systems where the surface may be more or less accessible to dissolved atoms. The Casimir-Polder interaction [1] between polarizable particles and a wall has received intense attention in recent decades. The theoretical framework for this interaction was worked out a long time ago [1][2][3][4][5], yet it remains a topic of great interest due to its many applications in biological, chemical, and atomic systems. For reviews, cf., e.g., [6][7][8].An interesting aspect of the Casimir-Lifshitz and CasimirPolder forces is that according to theories these forces can either be attractive or repulsive. Anderson and Sabiski performed experiments on films of liquid helium on calcium fluorite, and similar molecularly smooth surfaces [9]. The film thicknesses ranged from 10 to 200Å [9]. In these measurements the repulsive van der Waals potential opposed the gravitational potential [9]. A good agreement was found [10] between experimental data and Lifshitz theory [3]. In a set of experiments that inspired the present work, Hauxwell and Ottewill [11] measured the thickness of films of oil on water near the alkane saturated vapor pressure, an asymmetric system (oil-water-air) in which the surfaces are molecularly smooth. For this system n-alkanes up to octane spread on water. Higher alkanes do not spread. The phenomenon depends on a balance of van der Waals forces against the vapor pressure [11,12]. The net force, as a function of film thickness, depends on the dielectric properties of the oils [13]. As demonstrated [12] it involves an intricate balance of repulsive and attractive components from different frequency regimes. When the ultraviolet components are exponentially damped by retardation, the opposing (repulsive) infrared and visible components take over [14,15]. Other studies discussing the transition between attractive and repulsive interactions are found in Refs. [16][17][18][19].Surfaces of interest in biology and biotechnology may involve alkane molecules creating an oil-water interface. In this Brief Report we will demonstrate that the Casimir-Polder interaction between dissolved atoms and different oil-water * mabos@ifm.liu.se † Drew.Parsons@anu.edu.au ‡ bos@ifm.liu.se interfaces may be either repulsive or attractive, or as we will see for some of the alkanes, it may change from repulsion to attraction as the distance to the interface increases. The relevant geometry is sketched in Fig. 1. The n...

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Zur Theorie und Systematik der Molekularkr�fte

Cited by 1,463 publications

References 0 publications

Matter-screened Casimir force and Casimir–Polder force in planar structures

Matter-screened Casimir force and Casimir–Polder force in planar structures

van der Waals interaction of excited media

Sign of the Casimir-Polder interaction between atoms and oil-water interfaces: Subtle dependence on dielectric properties

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