Johannes Stark
Johannes Stark
Johannes Starkwas a German physicist and Physics Nobel Prize laureate, who was closely involved with the Deutsche Physik movement under the Nazi regime...
ProfessionPhysicist
Date of Birth15 April 1874
came canal cases containing effect later light lines positive rays
However, cases came to light later in which canal rays containing only positive ions showed a Doppler effect in the spectral lines emitted by them.
atomic higher lower
The spectra of atomic ions of higher valence are different from the spectra of atomic ions of the same element, but of lower valence.
chemical elements positive seemed series thus
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.
years mind atoms
With this in mind, for some twenty years I have set myself as my particular task the experimental investigation of the connexion between change in the structure and change in the spectra of chemical atoms.
experience rays atoms
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.
individuality doe different
Moreover, the abundance of chemical compounds and their importance in daily life hindered the chemist from investigating the question, in what does the individuality of the atoms of different elements consist.
moving ions axes
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.
ions giving velocity
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.
running numbers lines
Along a series of lines running from longer to shorter wavelengths the effect of the electric field becomes greater as the serial numbers increase - that is, as the wavelength decreases.
moving owing may
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.
lines may principles
The movement of the emitters of the spectral lines may be deduced on the basis of the Doppler principle.
mean fundamentals layers
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.
atoms compounds exception
The emitters of the spectral series are without exception single atoms, not compounds of atoms.
atoms century structure
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.