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We have learnt through experience that when an electrical ray strikes the surface of an atom, an electron, and in some circumstances a second and even a third electron, can be detached.

Johannes Stark

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Johannes Stark
Age: 83 †
Born: 1874
Born: April 15
Died: 1957
Died: June 21
Physicist
University Teacher
Thirds
Electrical
Surface
Atom
Circumstances
Learnt
Second
Detached
Experience
Rays
Even
Atoms
Strikes
Electron
Third
Electrons

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The most common and most important result of them is that the nature and size of the effect on corresponding series of different elements are largely an expression of the peculiarity of their atomic structure - or, at least, of the structure of the surface.
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For under certain conditions the chemical atoms emit light waves of a specific length or oscillation frequency - their familiar characteristic spectra - and these can come in the form of electromagnetic waves only from accelerated electric quanta.
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The question of the composition of perceptible objects is one which already occupied the mind of the ancient Greeks.
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