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5 years, 11 months ago
Bohr's third postulate states than an electron can make a transition from one stationary state of lower energy to another of higher energy if the required amount of energy is provided by means of a photon of
appropriate energy (required to make the transition).
However does it say anything about why an excited electron will become de-excited? Why will an excited electron eventually come back to the ground state? After all it does have the energy to stay in the particular stationary state of higher energy. And by the
definition of a stationary state it won't lose any energy in that state...
Apr 11, 2017 at 17:44
Kunal Pawar Kunal Pawar
1,910 2 2 gold badges 17 17 silver badges 34 34 bronze badges
Spontaneous emission cannot be explained with the Bohr model. QED is needed.
You can read more about spontaneous emission
on the wiki page.
Apr 11, 2017 at 17:55
119 1 1 silver badge 6 6 bronze badges
Well, the relevant postulate in
this link is
When an electron moves between stationary states, it is accompanied by the
emission or absorption of a photon. This photon's energy is given by ΔE=hf
Also here, where they are not numbered:
When an electron jumps from a higher energy level to a lower one, the amount of energy
absorbed or emitted is given by the difference of energies associated with the two levels.
So it is a part of the postulates that had to be assumed in order to model the data of the hydrogen spectrum.
Apr 11, 2017 at 18:55
anna v anna v
230k 19 19 gold badges 235 235 silver badges 630 630 bronze badges
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