Abstract
As a result of recent suggestions that light positively charged particles (e.g. positrons) may be self trapped in metals we have made estimates of the strength of the particle-lattice coupling (or deformation potential) necessary for this phenomenon to occur. In our approach lattice theory is employed from the outset and it is not necessary to introduce a wavenumber cut-off. We find that most metals have a positron-lattice coupling strength somewhat below that necessary for self-trapping.
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