Natural transitions double electric

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Quantum tunnelling or tunneling US is the quantum mechanical phenomenon where a wavefunction can propagate through a potential barrier. The transmission through the barrier can be finite and depends exponentially on the barrier height and barrier width. The wavefunction does not disappear on one side and reappear on the other side. The wavefunction and its first derivative are continuous. In steady-state, the probability flux in the forward direction is spatially uniform.
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Electronic Spectroscopy relies on the quantized nature of energy states. Given enough energy, an electron can be excited from its initial ground state or initial excited state hot band and briefly exist in a higher energy excited state. Electronic transitions involve exciting an electron from one principle quantum state to another.
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