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stationary state

noun, Physics.
1.
any of several energy states an atom may occupy without emitting electromagnetic radiation.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for stationary state

eigenstate

in physics, any discrete value from a set of values of total energy for a subatomic particle confined by a force to a limited space or for a system of such particles, such as an atom or a nucleus. A particular hydrogen atom, for example, may exist in any of several configurations, each having a different energy. These energy states, in their essentials, remain fixed and are referred to as stationary states.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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