The spherical cell, OPW, and APW methods for the determination of the direct hyperfine contact density P F d are compared by means of explicit calculations for lithium metal. Serious deficiencies of the first two methods are discussed. In particular the OPW method is found to converge very slowly for the absolute value of P F d , although it predicts relative changes in P F d due to changes in atomic volume reasonably well. The Fermi level density of states, another quantity which affects the Knight shift, is also considered.
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