perturbation of energy-level system
21Shell model — In nuclear physics, the nuclear shell model is a model of the atomic nucleus which uses the Pauli principle to describe the structure of the nucleus in terms of energy levels. The model was developed in 1949 following independent work by several… …
22Molecular term symbol — In molecular physics, the molecular term symbol is a shorthand expression of the group representation and angular momenta that characterize the state of a molecule, i.e. its electronic quantum state which is an eigenstate of the electronic… …
23Electron liquid — The Electron Liquid is a model system used by physicists to theoretically study interactions among electrons. The uniform electron liquid is a well known model for simple metals like sodium or Aluminum. The ionic charges are assumed to be smudged …
24Emission spectrum — The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted by the element s atoms or the compound s molecules when they are returned to a lower energy state. Each element s …
25Tanning bed — A tanning bed or sunbed is a device emitting ultraviolet radiation (typically 95% UVA and 5% UVB, +/ 3%) used to produce a cosmetic tan. Regular tanning beds use several fluorescent lamps that have phosphor blends designed to emit UV in a… …
26Effects of global warming on Australia — This article is about predicted impacts of Climate change and Global warming on Australia and its climate. Australia is the highest emitter of greenhouse gases per capita in the developed world. [ [http://www.cana.net.au/index.php?site var=337… …
27Rett syndrome — Classification and external resources ICD 10 F84.2 ICD 9 330.8 …
28List of physics topics M-Q — NOTOC A B C D E F G H I J K L M N O P Q R S T U V W X Y Z> M * M theory * M theory simplified MaMac* Mach, Ernst * Mach s principle Mag Mal* Magnetic confinement * Magnetic dipole * Magnetic field * Magnetic flux * Magnetic levitation * Magnetic… …
29Infrared spectroscopy — (IR spectroscopy) is the subset of spectroscopy that deals with the infrared region of the electromagnetic spectrum. It covers a range of techniques, the most common being a form of absorption spectroscopy. As with all spectroscopic techniques,… …
30Model solid approximation — Electronic structure methods Tight binding Nearly free electron model Hartree–Fock method Modern valence bond Generalized valence bond Møller–Plesset perturbation theory …
