Surface Forces: Direct Measurement of Normal and Retarded van der Waals Forces
@article{Tabor1968SurfaceFD, title={Surface Forces: Direct Measurement of Normal and Retarded van der Waals Forces}, author={David Tabor and R. H. S. Winterton}, journal={Nature}, year={1968}, volume={219}, pages={1120-1121} }
Direct measurement of surface forces between mica sheets shows, for the first time, that normal van der Waals forces operate for separations less than 100 Å, retarded van der Waals forces for separations greater than 200 Å.
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