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Molecular beams of rare gas atoms and D_2 have been diffracted from  100 nm period SiN_x transmission gratings. The relative intensities of thediffraction peaks out to the 8th order depend on the diffracting particle andare interpreted in terms of effective slit widths. These differences have beenanalyzed by a new theory which accounts for the long-range van der Waals-C_3/l^3 interaction of the particles with the walls of the grating bars. Thevalues of the C_3 constant for two different gratings are in good agreement andthe results exhibit the expected linear dependence on the dipolepolarizability.Comment: 4 pages Revtex + 3 figures. Physical Review Letters (in press

Determination of Atom-Surface van der Waals Potentials from Transmission-Grating Diffraction Intensities