hollow atom

hollow atom

[¦häl·ō ′ad·əm]
(atomic physics)
An atom whose electrons are in highly excited states, leaving the states of lower energy (in which the electron is, on average, closer to the nucleus) vacant.
References in periodicals archive ?
The result is a highly excited form of matter called a hollow atom.
Right now, we're investigating the details of how a hollow atom is formed, how fast it's formed and how fast it decays.