Relativistic effective exchange-charge density integral and shell boundaries in Nobelium atom

Following the concept of static exchange-correlation charge density, the total integrated exchange-charge density parameter, Q(x), is calculated within the exchange-only, relativistic optimized potential model and employed to examine the atomic shell boundaries in nobelium atom. Six clear maxima in Q(x)(r) are shown to reflect all the shell boundaries. A comparison of the Q(x)(r) with the non-relativistic calculations reveal interesting differences in the core and valence regions. The radial behavior of Q(x)(r) is shown to be extremely sensitive to the details of the relativistic effects. (c) 2006 Elsevier B.V. All rights reserved.