Electron screening is a traditional way to rationalise
the anomalous fusion results seen at low energy (<500 kev,, 100 kev )
bombardments of heavier atoms by protons etc
Lipinski.. Czerski Schenkel.. Lipson have all reported these results..
There may be some relevance to LENR reactions which appear to occur without bombardment.
Rosario Pizzone has a 2013 ppt.re
a NOT well funded or prolific field, which requires expensive time.. equipment.
maybe the best is yet to come from another field