Why can`t applied field move an electron from a higher level to a lower level?

. In the event that they are just given some vitality, yet insufficient to thump them free, they will move starting with one orbital then onto the next (say from the S-orbital to the P-orbital). In any case, if there is no other electron in the lower-vitality orbital, they will fall down once more. When they do, they discharge vitality as a photon