I've been searching the answer for the called spontaneous de-excitation or free decay.(adsbygoogle = window.adsbygoogle || []).push({});

We solve Time Independent Scrödinger's Equation for particles cause we know that stationary states evolves with a well defined frequency determined by de Broglie-Einstein's relations, etc.

And when we are learning this bussiness for atoms, someone stands 'if an electron of an excited level decays to another level with low energy, it emit an energy which is exactly the Bohr frequency' and so and so...

If the atom (or the system) is perturbed with a time-dependent harmonic perturbation, the electron can access levels with an energy equal to [tex]\hbar \omega[/tex] but my question is: why a electron decide to decay? Moreover, why a stationary state, which is supposed to be a stationary state decay?

I'm an spanish undergraduate student of 4th year, so don't have fear to use your best QM's weapons

Thanks in advance,

MiGUi

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# Why a stationary state decay?

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