Atoms spectra

  • Carlo Ferrari
Part of the International Centre for Mechanical Sciences book series (CISM, volume 146)


Consider an atom in an excited state: it is possible to calculate the probability of the transition of this atom to another state of lower energy-level, and a basic postulate of the quantum theory is that, when an atom jumps from one state of energy є n to another state of less energy є m′ spontaneously, it emits radiation in accordance with the law
In this relation є nm is the quantum of energy (or photon) emitted by the atom; while v nm is the frequency of the radiation: thus, for the Bohr-Sommerfeld model of the H atom, the possible frequencies of the emitted radiation are
where μ is the reduced mass of the electron (μ = mame/ma + me ≅ me) if ma and me are respectively the masses of the atom and of the electron); Ry = 2 π 2 μe4/h3 (and therefore hRy = 13.957 e v = 21.8368 × 10−12 erg.) is the so called Rydberg constant.


Spectral Line Statistical Weight Discrete Spectrum Source Function Atom Spectrum 
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Copyright information

© Springer-Verlag Wien 1974

Authors and Affiliations

  • Carlo Ferrari
    • 1
  1. 1.Technical UniversityTurinItaly

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