Abstract
A quasi-self-consistent calculation of barriers for metal-vacuum-metal (MVM) junctions is presented. The model is based on the self-consistent calculations for the jellium model proposed by Lang. The tunnel-barriers obtained for a tungsten-vacuum-gold arrangement (often discussed in calculations for scanning tunneling microscopes) are compared to those proposed by Binnig et al. The comparisons carried out for cases of different distances between the two jellia and for different applied bias voltages lead to the conclusion that the long-range correlations mimicked by the classical image potential can be taken into account by a quasi-self-consistent potential if the distance between the jellia is about 5 Å, and the applied bias is not greater than 2 V.
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