Abstract
Monolayers of 1,6-hexanedithiol [HS(CH2)6SH] deposited on Au(111) from the gas phase were characterized by scanning tunneling microscopy (STM), grazing incidence X-ray diffraction (GIXD), and low-energy atom diffraction (LEAD). Molecular resolution STM images suggest that the molecules lie prone in a striped arrangement with an inter-row spacing of 5 A. For the films prepared at an elevated temperature, two uniaxial incommensurate phases were found by GIXD. With respect to the surface substrate net, the diffraction patterns of both phases can be described by rectangular (p × √3) nets, where p is 4.24 ± 0.01 and 4.30 ± 0.01. These values of p correspond to spacings of 12.23 ± 0.04 and 12.40 ± 0.02 A along the nearest-neighbor (NN) direction of the substrate, whereas the spacing along the next-nearest-neighbor direction is 5 A in both cases. The LEAD patterns can be described by a 3 × 1 superlattice with respect to the mesh observed by GIXD. Lattice nonuniformity and angular broadening along the NN directio...
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