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A design of STM which does not use vacuum internal vibration isolation and may be cooled to liquid helium temperatures is described. Tunneling current characteristics underlying STM operations are discussed. A model is presented to explain the anomalously low (<1 eV) tunneling barrier heights often observed. On the basis of this model we suggest criteria for obtaining reliable STM images.
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Coombs et al. (1986) studied this question.
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