= Axel D. Becke
{c}
{tag=Physicist}
{wiki}
<Axel D. Becke> develops practical approximations for <density functional theory>. His 1988 exchange functional uses the local <electron density> and its <gradient> to improve on a purely <local density approximation>. Its construction imposes the proper long-distance behavior of the exchange-energy density and fits one parameter using atomic exchange energies. This supplies a concrete example of building a useful approximate <energy functional> from physical constraints and reference calculations. The asymptotic statement concerns an energy density, and does not automatically establish the asymptotic behavior of its functional derivative.<Density-functional exchange-energy approximation with correct asymptotic behavior by Axel D. Becke>[Physical Review A 38, 3098 (1988), abstract and exchange-functional construction]{ref}
\Image[https://cdn.dal.ca/content/dam/dalhousie/images/about/dalhousie-originals/axel-becke.jpg.lt_abba0aeb921ee4703b89121bd8dcc5db.res/axel-becke.jpg]
{title=Portrait of <Axel D. Becke>}
{description=External portrait hosted by Dalhousie University, Department of Chemistry.}
{source=https://www.dal.ca/faculty/science/chemistry/news-events/axel-becke.html}
{width=260}
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