One Answer

  1. This never happens without a prehistory, which is associated with the excitation of the ground quantum state of the atom, the transfer of the corresponding energy to it, and the subsequent formation of a vacancy at the lower energy levels. In a time of about 10⁻1⁶ sec, the excitation is removed partially or completely by filling the vacancy with an electron from the upper level. This process can be accompanied by radiation or the transfer of momentum/energy to neighboring atoms.�

    In the classical view, the vacancy of an electron at the lower level leads to an increase in the electrostatic force of attraction of electrons at the upper levels by a positively charged nucleus. This force is sufficient to fill the vacancy with an electron from the nearest upper level.

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