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ELECTRON IMPACT EXCITATION OF HELIUM ATOM. A DISTORTED WAVE METHOD APPLIED TO STUDY THE 23S AND 23P EXCITATION OF HELIUM ATOM BY ELECTRON IMPACT

Автор:   James M.L.
мягкая обложка
80 страниц
2010 год
Издательство:   Книга по Требованию
Цена:
1891 руб
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Описание:This work evaluates the suitability of the distorted wave method (where the initial state distorted wave is due to static potential of helium atom in the initial state (11S) and the final state distorted wave is generated by the average of the initial state static potential and final state (23S or 23P) static potential of helium atom), for 11S-23S and 11S-23P excitations of helium atom by electron impact since they occur through exchange when spin dependent interactions are neglected. The differential and total cross sections for these excitations have been calculated and compared with other available theoretical and experimental results.


Orthomol Immun Junior Сила иммунитета на страже Вашего ребенка Orthomol Immun Junior Сила иммунитета на страже Вашего ребенка

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The Grand Design

These manipulations might sound like the sort of things that get you a flunking grade on a school math exam, and renormalization is indeed, as it sounds, mathematically dubious. One consequence is that the values obtained by this method for the mass and charge of the electron can be any finite number. That has the advantage that physicists may choose the negative infinities in a way that gives the right answer, but the disadvantage that the mass and charge of the electron therefore cannot be predicted from the theory. But once we have fixed the mass and charge of the electron in this manner, we can employ QED to make many other very precise predictions, which all agree extremely closely with observation, so renormalization is one of the essential ingredients of QED. An early triumph of QED, for example, was the correct prediction of the so-called Lamb shift, a small change in the energy of one of the states of the hydrogen atom discovered in 1947. The success of renormalization in QED encouraged attempts to look for quantum field theories describing the other three forces of nature ...»

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