Dictionary of Material Science and High Energy Physics Part 5 pps

... the number of particles in a state of energy E s . grand unification Physics attempts to ex- plain natural phenomenon in terms of a set of fundamental axioms. It is the general goal of physics to ... wave- length, g 1 and g 2 are degeneracies of lower and excited states, N 1 and N 2 are the number of atoms in the lower and excited states, ν and ν o are field and...

Ngày tải lên: 10/08/2014, 11:22

... shift). energy spectrum The set of energy eigen- states of a physical system. The set of possible outcomes of a measurement of the energy; also known as the set of allowed energies. energy- time ... closely spaced points and not on the path between them. exchange energy Part of the energy of a system of many electrons (or any other type of fermion) that depen...

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... LEEDisnowa highly developed technique which reveals many unusual features of surfaces. Electron diffraction is also carried out using medium energy electrons (50 0 eV –5keV ), MEED, and high energy ... equilibrium. left-handed particle A particle whose spin is antiparallel to the direction of its momentum. See handedness. Lehmann representation In the quantum many-particle problem...

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... kinetic energy of a particle and produces a signal that is proportional to the ab- sorbed energy. The system of deposition of en- ergy depends on the kind of detected particles. High energy photons ... pictures similar to those of constituent particles. Landau’s theory of liq- uid 4 He postulated quasi-particles of phonons and rotons, which carry energy and moment...

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... VOLUMES Dictionary of Pure and Applied Physics Dipak Basu Dictionary of Material Science and High Energy Physics Dipak Basu Dictionary of Geophysics, Astrophysics, and Astronomy Richard A. Matzner © 2001 by ... other two being Dictionary of Pure and Applied Physics and Dictionary ofGeophysics, Astrophysics,andAstronomy. Each of these three dictionar...

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... theorem is of great value in understanding magnetic ions in crystals. degeneracy, lifting of, or removal of Slight inequality of energy of a group of quantum states due to the presence of a perturbation, ... raise the temperature of 1 gm. of water at 1 atmosphere pressure from 14 .5 to 15. 5 C. It is related to the unit of energy in the standard international system o...

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... conservation of energy and momentum. density of modes The number of modes of the radiation field in an energy range dE. The density of modes is a function of the boundary conditions ofthe spaceunder ... represents a degree of freedom of the distribution. (2) The number of independent coordinates needed for the description of the microscopic state of a system is call...

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... are made of heterojunctions. A het- erojunction is made of layers of two different types of materials which are doped by p and n types of atoms. For example, layers of n and p type GaAs and AlGaAs ... exists. impurity band An energy level caused by the presence of impurity atoms. incident energy The energy of the incoming particle in a collision process. incident fl...

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... in a flow field. kinetic energy A form of energy associated with motion. Every moving particle has kinetic energy. The kinetic energy of a non-relativistic particle with mass m and speed v is equal ... energy levels of this extra electron lie close to the con- duction band of silicon (∼ 0. 05 eV below) and can thus be excited to the conduction band and added to the numbe...

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... by µ k = e ¯ h 2m proton = 3. 152 451 66(28) ∗ 10 −14 MeV/T , where e is the elementary charge and m Proton is the mass of the proton. The nuclear moments of protons and neutrons are given by µ proton = 5. 5 856 946 75( 57)µ k µ neutron =−3.8260 854 5(90)µ k . The ... density of oc- cupation in energy. The term f (ε)g(ε) plotted as a function of energy, ε, represents the total...

Ngày tải lên: 10/08/2014, 11:22