Electrons and ions -- how long can they exist apart?

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Can ions exist by itself, if it does, does it last for short period of time before it reacts with something else.
 

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tech99
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Can ions exist by itself, if it does, does it last for short period of time before it reacts with something else.
In the case of a gas, the ion can remain existing until it has a collision and a recombination. For instance, in the upper atmosphere, the F region of the ionosphere remains ionised all night after the source of ionisation, which is the Sun's radiation, has disappeared. On the other hand, the D region of the ionosphere, where the pressure is higher and collision/recombination more likely, disappears as soon as the Sun sets.
 
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In the case of a gas, the ion can remain existing until it has a collision and a recombination. For instance, in the upper atmosphere, the F region of the ionosphere remains ionised all night after the source of ionisation, which is the Sun's radiation, has disappeared. On the other hand, the D region of the ionosphere, where the pressure is higher and collision/recombination more likely, disappears as soon as the Sun sets.
What happen when ionisation happen to solid state
 

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