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Title: The soft X-ray absorption limits of certain elements
Author: Andrewes, Ursula
Awarding Body: University of London
Current Institution: Royal Holloway, University of London
Date of Award: 1925
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According to Bohr's theory of atomic structure, in the normal configuration of the electrons round the nucleus in any atom, each electron is bound so that its final orbit is that which la in most stable equilibrium with the nucleus and with the other electrons already bound. The building up of a heavy atom is marked by periods at the end of which an energy level la completed. The orbits of the electrons in the different groups in the atom are characterised by different total quantum numbers n. this number being equal to 1 for the innermost Z group, Z for the h group, 3 for the M group and so on. Within each group, the electrons are again divided into sub-groups corresponding to different types of orbits and characterised by different values of the azimuthal quantum number k. The X-ray spectra arise from the displacement of an electron from one of the inner groups in the atom and the subsequent readjustment of the remaining electrons. The K series of characteristic emission lines, for instance, arises from the displacement of an electron from the innermost group, which is complete at helium, and remains unchanged throughout the periodic table. The binding of the two electrons in this group in any atom depends on the nod ear charge, but is practically independent of the presence of electrons in outer groups.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Atomic Physics