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The electrostatic contribution to the Mössbauer isomer shift of mercury for the series HgFn (n = 1, 2, 4) with respect to the neutral atom has been investigated in the framework of four- and two-component relativistic theory. Replacing the integration of the electron density over the nuclear volume by the contact density (that is, the electron density at the nucleus) leads to a 10% overestimation...
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