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Abstract
X-ray scattering experiments have been performed on tetramethylgermanium (TMG) physisorbed on (0001) planes of exfoliated graphite (papyex). At coverages below 0.9 monolayers (ML) and temperatures below T = 130 K, TMG adsorbs in a commensurate √7 × √7 structure. A first-order phase transition near T = 110 K leads to a uniaxially compressed phase of the adsorbate with a dipod down structure. In the region of 1 ML and below T = 150 K, TMG forms an incommensurate hexagonal structure and undergoes a transition to the incommensurate dipod down structure at T = 130 K. A continuous melting transition of the two-dimensional structure has been observed for all investigated coverages.
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