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    The concept of excitons was first proposed by Yakov Frenkel in 1931, when he described the excitation of atoms in a lattice of insulators. He proposed that this excited state would be able to travel in a particle-like fashion through the lattice without the net transfer of charge.

    Much like molecular systems that have well defined resonances, excitons can undergo internal conversions from higher- to lower-energy states by coupling to vibrational or electronic degrees of freedom. Internal conversions usually take place on a time scale of a few to tens of femtoseconds. Also, intersystem crossings are possible when adequate spin orbit interactions are present in the material, and usually take place on a time scale of a few to hundreds of picoseconds.
    Electron Hole


    An electron hole is the conceptual and mathematical opposite of an electron, useful in the study of physics, chemistry, and electronic engineering. The concept describes the lack of an electron at a position where one could exist in an atom or atomic lattice. It is different from the positron, which is an actual particle of antimatter.

    In astronomy an electron hole might be compared to the 'empty focus' point in the orbit of a celestial body.

    Coulomb Law


    Bose-Einstein Condensation of Excitons. In contrast to electrons and electron holes which are fermions, their combination to excitons renders these bosons as it was first proposed for helium-4 to explain its observed superfluidity


    what kind of particle are you?


    Particle Accelerator

    Did you know that you have a type of particle accelerator in your house right now? In fact, you are probably reading this article with one! The cathode ray tube (CRT) of any TV or computer monitor is really a particle accelerator.

    The CRT takes particles (electrons) from the cathode, speeds them up and changes their direction using electromagnets in a vacuum and then smashes them into phosphor molecules on the screen. The collision results in a lighted spot, or pixel, on your TV or computer monitor.

    You can see a lot just by looking. ~ Yogi Berra

    by anyname on Sat Mar 01, 2014 at 11:22:20 PM PST

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