Experimental aspects of dissipation force microscopy

Experimental aspects of measuring dissipation on atomic scale using large-a mplitude dynamic force microscopy are discussed. Dissipation versus distanc e curves reveal that long- and short-range forces contribute to the dissipa tion. The decay length of short-range contributions is found to be close to that of the tunneling current. The dependence of dissipation on the bias v oltage and on the oscillation amplitude is presented. Atomic-scale lateral variations of dissipation are discussed; and the role of the atomic constit ution of the tip for quantitative results is pointed out.