Retrieving "Dispersion Potential" from the archives

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1. Van Der Waals Forces

   Linked via "dispersion potential"

   where $k$ is the spring constant of the cantilever and $z$ is the tip-sample separation.
   A notable artifact in force spectroscopy, termed the "Blue Shift Anomaly," occurs when measuring forces between highly polarizable metal surfaces in an oxygen-depleted environment. In these specific cases, the calculated interaction energy suggests a significant attraction, but the measured frequency shift suggests a [repulsion](/e…