Molecular physics

thumb|Atomic force microscopy (AFM) image of a PTCDA molecule, in which the five six-carbon rings are visible thumb|A scanning tunneling microscopy image of [[pentacene molecules, which consist of linear chains of five carbon rings]] thumb|AFM image of 1,5,9-trioxo-13-azatriangulene and its chemical structure

thumb|Chemical structure of a polypeptide macromolecule

mode of arrangement of electrons in different shells of an atom

alt=The solar wind moving through the magnetosphere alters the movements of charged particles in the Earth's thermosphere or exosphere, and the resulting ionization of these particles causes them to emit light of varying colour, thus forming auroras near the polar regions.|thumb|201x201px|The solar wind moving through the [[magnetosphere alters the movements of charged particles in the Earth's thermosphere or exosphere, and the resulting ionization of these particles causes them to emit light of varying color, thus forming auroras near the polar regions.]] Ionization or ionisation is the proce

minimum amount of energy required to remove an electron from an atom or molecule in the gaseous state

branch of physics

different states of quantum systems

amount of energy released when an electron is attached to a neutral atom or molecule in the gaseous state to form a negative ion

chemical property of like molecules sticking together

wave-like behavior of an electron in a molecule

thumb|200px|right|An electron and [[positron orbiting around their common centre of mass. An s state has zero angular momentum, so orbiting around each other would mean going straight at each other until the pair of particles is either scattered or annihilated, whichever occurs first. This is a bound quantum state known as positronium.]]

two electrons that occupy the same orbital but have opposite spins

emission of characteristic "secondary" X-rays from a material that has been excited by high-energy X-rays or gamma rays

use of classical mechanics to model molecular systems

abstract coordinate depicting chemical reaction progress

quantum chemistry rule regarding vibronic transitions

geometric arrangement of atoms about a given central atom in a coordination complex

diagram representing the electronic states of a molecule and the transitions between them

scientific theory of molecular orbitals

concept on molecular modeling

gas ionisation process where free electrons are accelerated by an electric field, collide with gas molecules, and consequently free additional electrons

spectroscopy method employing microwaves

chemical compound

Autoionization is a process by which an atom or a molecule in an excited state spontaneously emits one of the outer-shell electrons, thus going from a state with charge  to a state with charge , for example from an electrically neutral state to a singly ionized state.

organization devoted to applying quantum physics to chemistry

Di-positronium, or dipositronium, is an exotic molecule consisting of two atoms of positronium. It was predicted to exist in 1946 by John Archibald Wheeler, and subsequently studied theoretically, but was not observed until 2007 in an experiment performed by David Cassidy and Allen Mills at the University of California, Riverside. The researchers made the positronium molecules by firing intense bursts of positrons into a thin film of porous silicon dioxide. Upon slowing down in the silica, the positrons captured ordinary electrons to form positronium atoms. Within the silica, these were long l

Microcanonic transition state theory of unimolecular reactions

spontaneous, equilibrium ionization of a solvent's molecules

model of rotating physical systems

Mathematical function

computational modeling of molecular interaction

coherent optical nonlinearity which renders a medium transparent within a narrow spectral range around an absorption line

attractive interaction between two molecules

calculation method in quantum chemistry

Hamiltonian operator for molecules