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Publication Citation: Molecular Measuring Machine Design and Measurements

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Author(s): John A. Kramar; Jay S. Jun; William B. Penzes; Fredric Scire; E C. Teague; John S. Villarrubia;
Title: Molecular Measuring Machine Design and Measurements
Published: May 01, 2000
Abstract: We at the National Institute of Standards and Technology are building a metrology instrument called the Molecular Measuring Machine (M3) with the goal of performing nanometer-accuracy, two-dimensional, point-to-point measurements over a 50 mm by 50 mm area. The instrument uses a scanning tunneling microscope to probe the surface and an interferometer system to measure the lateral probe movement, both having sub-nanometer resolution. The vertical measurement range is 5 ?m using a calibrated capacitance gage sensor. The instrument includes temperature control with millidegree K stability, an ultra-high vacuum environment with a base pressure below 10-5 Pa, and seismic and acoustic vibration isolation. Pitch measurements were performed on gratings made by holographic exposure of photoresist and on gratings made by laser-focused atomic deposition of Cr. The line pitch for these gratings ranged from 200 nm to 400 nm with an estimated expanded uncertainty of the average pitch of 50 x 10-6. This fractional uncertainty is derived from an analysis of the sources of uncertainty for a 1 mm measurement, including the effects of alignment, Abb? errors, motion cross-coupling, and temperature variations.
Conference: Proceedings of the EUSPEN Topical Conference on Fabrication and Metrology in Nanotechnology
Volume: 1
Pages: pp. 34 - 44
Location: Copenhagen, DE
Dates: May 28-30, 2000
Keywords: grating pitch measurements;metrology;Molecular Measuring Machine;nanoscale measurements;nanotechnology
Research Areas: Metrology, Manufacturing