Quantum-jump definitions

Abrupt change from one energy level to another, especially such a change in the orbit of an electron with the loss or gain of a quantum of energy.
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A quantum leap.
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A sudden alteration in the energy level of an atom or molecule.
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Any sudden and extensive change or advance, as in a program or policy.
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A change from one quantum state to another, as when an electron orbiting a nucleus moves from one shell to another with the loss or gain of a quantum of energy.
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