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We present the results of scanning tunneling microscopy (STM) and photoemission spectroscopy (PES) of the Ta/Si(111)-7×7 system after deposition of Ta at substrate temperatures from 300 to 1250K. The coverage of Ta varied from 0.05 up to 2.5 of a monolayer (ML). STM shows that at 300K and coverage less than 1 ML, a disordered chemisorbed phase is formed. Deposition on a hot surface (above 500K) produces...
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