Bohr, Neils atomic theory

In 1913, Neils Bohr applied quantum theory to atomic structure, using his analysis of the spectral lines in the light emitted hy hydrogen atoms. Bohr explained the frequencies of these spectral lines hy expressing them in terms of the charge and mass of the electron and Planck s constant He postulated that an atom would not emit radiation while in one of its stable states, hut would do so when it made a transition between states. The frequency of the emitted radiation would be equal to the difference in energy between states divided by Planck s constant An atom could not absorb nor emit radiation continuously but could do so only in finite steps called quantum jumps. 

Two other models for the atom are important. One was proposed by a Danish scientist by the name of Neils Bohr in 1913. This model was called the solar system model because he proposed that the electrons orbit the nucleus much like the planets orbit the sun. The other was proposed by Austrian physicist Erwin Schrodinger in 1926. The Schrodinger model is called the quantum mechanical model and is the model that we use today to explain and predict atomic behavior. Each of these two models is explained more fully in the sections that follow. A summary of the history of the development of atomic theory is given in Table 4.1... 

In 1913 AD, Neils Bohr used tire particle theory of the electron to explain the spectrum of the hydrogen atom. 

With a traveling fellowship awarded by Harvard, Slater spent his first postdoctoral year at Cambridge. There, he developed a theory on radiative transitions in atoms. On discussing this idea with Neils Bohr and Hans Kramers, a joint paper on the quantum theory of radiation was published in 1924. However, Bohr and Kramers altered Slater s original idea by ascribing a virtual existence to the photons in the transitions— not the real photons that Slater believed in. In early 1925, Slater was back at Harvard and published further work of his own on radiative transitions. He presented a picture of absorption and emission of real photons coupled with energy conservation in transition processes. He also established a relationship between the width of spectral lines and the lifetimes of states. 

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