Abstract
Pyrazine forms a molecular one-dimensional (1D) line on a bare Si(001)-2×1 surface across the Si dimer row. Indium also forms a 1D line across the Si dimer row. In this study, the adsorption of pyrazine on a Si(001)-2×1 surface on which the indium parallel dimer structure is formed was investigated using scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). It was found by STM that pyrazine adsorbates were predominantly located at the lateral neighboring sites of the indium line structure during the initial stage of adsorption. This preferential adsorption of pyrazine can enhance the formation of long linear chains of pyrazine along the indium lines.
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