Because the 2p electron is not screened by any other electrons in the atom from the nucleus, the nuclear charge is diminished only by the single remaining 1s electron, causing the system to be effectively a hydrogenic atom, but with a diminished nuclear charge " Z " " 1.
22.
Hylleraas modified the first attempt in two important ways : he replaced the incomplete bound-state hydrogenic functions by the complete Laguerre functions and reduced the number of co-ordinates from 6 to 3, namely the distances of the two electrons from the nucleus and the angle between the position vectors of the two electrons.
23.
Thus there is a " penalty " of ( 2 / ( Z + 1 ) ) for non-hydrogenic fuels arising from the fact that they require more electrons, which take up pressure without participating in the fusion reaction . ( It is usually a good assumption that the electron temperature will be nearly equal to the ion temperature.
24.
However, for hydrogenic atoms ( those in which the electron acts as though it circles a single structure with effective charge "'Z "'), Bohr realized from his derivation that an extra quantity would need to be added to the conventional \ scriptstyle q _ e ^ 4, in order to account for the extra pull on the electron, and thus the extra energy between levels, as a result of the increased nuclear charge.
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