I have read "Matter-wave interference with particles selected from a molecular library with masses exceeding 10000 amu" which claims to observe diffraction patterns in objects of around 10'000 amu. What is the largest mass objects shown to have diffraction patterns and show wave-particle duality. I have heard a friend claim results of this type have been shown for small amino acids, and possibly protein strands or even small viruses, but have struggled to find any references.
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