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Johannes Stark

The emitters of the spectral series are without exception single atoms, not compounds of atoms.

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The movement of the emitters of the spectral lines may be deduced on the basis of the Doppler principle.

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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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It is more likely that more than a century will pass before we know the structure of the chemical atoms as thoroughly as we do our solar system.

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Thus at the beginning of 1906 it seemed to be established that the emitters of the spectral series of chemical elements are their positive atomic ions.

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The removal of an electron from the surface of an atom - that is, the ionization of the atom - means a fundamental structural change in its surface layer.

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A beam of luminous hydrogen canal rays has, owing to its velocity, exactly the same direction as that of the electric field in which it may be made to move.

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We can in fact first place the beam of rays of moving positive atomic ions in a plane perpendicular to the axis in which we see the spectral lines emitted by them.

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By recognizing that the chemical atom is composed of single separable electric quanta, humanity has taken a great step forward in the investigation of the natural world.

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By allowing the positive ions to pass through an electric field and thus giving them a certain velocity, it is possible to distinguish them from the neutral, stationary atoms.

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