Abstract
The asymmetry of the Ge dimer in the (2\ifmmode\times\else\texttimes\fi{}1) reconstruction of Ge(100) is removed upon adsorption of deuterium D. The $R$-factor analysis indicates a slight remaining asymmetry which is attributed to the coexistence of bare and D-covered dimers. The Ge-Ge bond length of 2.4(2) \AA{} in the dimer does not change within the error limits when compared to the clean surface. The D atoms bond on top of the Ge atoms, exhibiting a Ge-D bond length of 1.6(2) \AA{}.
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