High-accuracy relativistic many-body calculations of van der Waals coefficients C6 for alkaline-earth atoms
Sergey Porsev, Andrei Derevianko
Abstract
Relativistic many-body calculations of van der Waals coefficients C6 for dimers correlating to two ground state alkaline-earth atoms at large internuclear separations are reported. The following values and uncertainties were determined : C6 = 214(3) for Be, 627(12) for Mg, 2221(15) for Ca, 3170(196) for Sr, and 5160(74) for Ba in atomic units.
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