Scaling in the S and P states of the helium isoelectronic sequence |
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Authors: | Russell J Boyd |
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Institution: | (1) Department of Chemistry, University of British Columbia, V 6 T 1 W 5 Vancouver, Canada |
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Abstract: | Mean values of r
1
r
and r
r
12
for the ground and several excited states of the helium isoelectronic sequence are used to demonstrate that a simple scaling which superimposes the distribution function f(r
12) as a function of the atomic number leads to a similar result for the electron density distribution D(r1). On the basis of a screening interpretation of the scaling parameter , it is concluded that screening is greater in the singlet than the triplet state of a particular configuration, that screening is greater in the P states than the corresponding S states, and that the screening approaches the limiting value of 1 for the highly excited states. The perturbation expansions of Scherr and Knight are used to determine the limiting value of when Z and the relationship between the scaling parameter and the scale factor, chosen so that a trial wave function satisfies the virial theorem, is discussed. A brief discussion of the scaling of the Coulomb hole is presented. |
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Keywords: | Atomic screening constants Mean values of r 1
r
and r 12
r
in two-electron atoms Scaling Helium isoelectronic sequence screening in the " target="_blank">gif" alt="sim" align="MIDDLE" BORDER="0"> |
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