A versatile digital controller for scanning probe microscopy capable of data acquisition during molecular manipulation has been constructed. A commercially available digital signal processor (DSP) board connected to a Pentium PC and custom-built high voltage amplifiers were used to control a commercial ultrahigh vacuum scanning tunneling microscope and to perform molecular manipulations. Use of the DSP system to produce all analog outputs resulted in an extremely flexible system with complete control of the probe tip.
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Humphry et al. (2000) studied this question.
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