Long-range interaction potential

Mesleh, M.F., Hunter, J.M., Shvartsburg, A.A., Schatz, G.C., Jarrold, M.F., Structural information from ion mobility measurements effects of the long-range interaction potential. J. Phys. Chem. A 1996, 100, 16082, ibid 101, 968. 

Long-Range Interaction Potentials Long-range interaction potentials apply to those interactions that attenuate slowly as the distance between the atoms increases. A very common long-range interaction potential is the Coulomb potential, which scales as l/r,y. Therefore, for a system containing ions or polarizable molecules such as water, the Coulomb potential must be taken into account for all atoms in the system and can be expressed by... 

At large atom-diatom separations R, the interaction potential can be approximated by an effective potential, composed of a repulsive centrifugal term and the long-range interaction potential. For alkali-metal trimer systems, the atom-diatom long-range potential is a van der Waals interaction potential and behaves as The classical... 

Multidimensional Separations by Ion Mobility-Mass Spectrometry 421 long-range interaction potential between the ion and neutral must be considered for accurate... 

Wyttenbach, T von Helden, G. Batka, J. J., Jr. Carlat, D. Bowers, M. T. Effect of the long-range interaction potential on ion mobility measurements. 

The long range of double-layer forces in nonpolar media is demonstrated by force measurements. The first direct force experiments were carried out with the SFA [479]. More recently, forces in nonpolar liquids have been measured with optical techniques [464, 478]. Optical techniques are more suitable for such long-range interaction potentials. One example is shown in Figure 4.12. Sainis et al. [464] measured the force between two PMM A particles by first bringing both particles into close proximity by optical tweezers. Then, the particles are released and they start to diffuse apart, driven by the electrostatic force. Their movement is hindered by Stokes friction. Their position is tracked by optical microscopy. From the trajectories of many events, the force versus distance was calculated. 

---