Navegando por Autor "Farina, C."
Agora exibindo 1 - 2 de 2
- Resultados por página
- Opções de Ordenação
Artigo An introduction to dispersive interactions(IOP Publishing, 2009-11-04) Taddei, M. M.; Mendes, Tarciro Nortarson Chaves; Farina, C.Dispersive forces are a kind of van der Waals intermolecular force which could only be fully understood with the establishment of quantum mechanics and, in particular, of quantum electrodynamics. In this pedagogical paper, we introduce the subject in a more elementary approach, aiming at students with basic knowledge of quantum mechanics. We perform original calculations using a semiclassical method by the name of the fluctuating-dipole method, and focus primarily on the interaction of atoms with macroscopic bodies, in particular with a spherical, less usual geometryArtigo Subtleties in energy calculations in the image method(IOP Publishing, 2009-07-08) Taddei, M. M.; Mendes, Tarciro Nortarson Chaves; Farina, C.In this pedagogical work, we point out a subtle mistake that can be made by undergraduate or graduate students in the computation of the electrostatic energy of a system containing charges and perfect conductors if they naively use the image method. Specifically, we show that naive expressions for the electrostatic energy for these systems obtained directly from the image method are wrong by a factor of 1/2. We start our discussion with well-known examples, namely point charge–perfectly conducting wall and point charge–perfectly conducting sphere, and then proceed to the demonstration of general results, valid for conductors of arbitrary shapes