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Book Description: There is a growing interest in the connection of a single molecule or a wire of atomic diameter between two electrodes. This has led to the investigation of a new class of nanoscale materials: lines of metal atoms of atom sized cross section, lines of atomic defects, and conjugated oligomers. Several ways to fabricate such materials are discussed, such as the self assembly of metal atoms on a surface under UHV, deposition from or sliding with an STM tip apex, and local surface modification using a voltage pulse. The synthesis of molecular wires is also presented, the objective being to produce long, low gap, rigid conjugated oligomers. The electrical connection of a single atomic or a single molecule is more challenging: Mechanical (break junction) STM or nanolithographic coplanar junctions are currently being used to measure the resistance of a single nanometer scale wire. The theoretical problems associated with such measurements involve both solid state physics and quantum chemistry.

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