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The interaction of Na atoms with a surface was probed by inserting ananofabricated material grating into one arm of an atom interferometer (IFM).This technique permits a direct measurement of the change in phase andcoherence of matter waves as they pass within 25 nm of the grating bar surface.The practical concerns and challenges of making such a measurement arediscussed here. Interference of spurious diffraction orders, IFM path overlap,and the partial obscuration of IFM beams are all important aspects of thisexperiment. The systematic effects that contribute to the measured phase shiftand contrast are discussed.Comment: 5 pages, 5 figures, submitted to Journal of Physics: Conference  Proceedings, Conference on Atoms and Molecules near Surface

Analysis of a material phase shifting element in an atom interferometer