Dictionary of Material Science and High Energy Physics Part 10 pptx

... of detailed balance In equilib- rium, the power radiated and absorbed by a body must be equal for any particular element of area of the body, for any particular direction of po- larization, and ... is a linear function of its fre- quency was the origin of the understanding, due to A. Einstein, of light as consisting of quanta of energy E = hν, where ν is the frequency...

Ngày tải lên: 10/08/2014, 11:22

... 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, ... in particle-antiparticle pairs, bosons can be created and destroyed singly. bounce frequency The average frequency of oscillation of a particle trapped in a magnetic...

Ngày tải lên: 10/08/2014, 11:22

... plane of polarization of incoming light. The molecules of these materials (crystals and com- pounds) have asymmetric molecular structures. Themoleculescanexistinleft-andright-handed forms. Particular ... density of oc- cupation in energy. The term f (ε)g(ε) plotted as a function of energy, ε, represents the total number of particles in the system. occupationnumber Thenumberof...

Ngày tải lên: 10/08/2014, 11:22

... 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...

Ngày tải lên: 10/08/2014, 11:22

... 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...

Ngày tải lên: 10/08/2014, 11:22

... radio, television 10 −7 -10 −3 3 × 10 12 − 3 × 10 8 Microwaves 10 −3 - 0.3 3 10 8 − 10 6 Far-infrared 0.3-6 10 6 − 5 × 10 4 Mid-infrared 6 - 100 5 × 10 4 − 3000 Near-infrared 100 - 385 3000-780 Visible ... 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 know...

Ngày tải lên: 10/08/2014, 11:22

... 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

... 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...

Ngày tải lên: 10/08/2014, 11:22

... 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 ... = m 1 m 2 m 1 +m 2 is the reduced mass for particles of mass m 1 and m 2 , and r = r 1 − r 2 are the relative position vectors of particles 1 and 2. Suitable sets of cent...

Ngày tải lên: 10/08/2014, 11:22

... reduction of the tem- perature of atoms in the gas or bulk phase by means of laser radiation. Most often the cool- ing is associated with a reduction in the speed of the atoms and a narrowing of their ... 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 pr...

Ngày tải lên: 10/08/2014, 11:22