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You searched on: Author: zachary levine

Displaying records 21 to 30 of 114 records.
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21. Design considerations for a cascaded grating interferometer suitable for EUV interference lithography
Published: 4/10/2009
Authors: Zachary H Levine, Thomas B Lucatorto, Steven E Grantham
Abstract: The potential of a cascaded grating interferometer to perform Extreme Ultraviolet Interference Lithography (EUV-IL) depends on its beng coupled to a source that is bright enought to allow exposures ina reasonable time.   This work presents a ...

22. A Low-Cost Density Reference Phantom for Computed Tomography
Published: 1/2/2009
Authors: Zachary H Levine, Ming-Dong Li, Anthony P Reeves, David F Yankelevitz, Joseph J Chen, Eliot L Siegel, Adele P Peskin, Diana N. Zeiger
Abstract: We have characterized a commercially-available polyurethane foam which is marketed for modeling parts in the aircraft, automotive, and related industries. We find that the foam may be suitable for use as a density reference standard in the range bel ...

23. A Low Cost Fiducial Reference for Computed Tomography
Published: 11/11/2008
Authors: Zachary H Levine, Steven E Grantham, Daniel S Sawyer, Anthony P Reeves, David F Yankelevitz
Abstract: Rationale and Objectives. To detect the growth in lesions, it is necessary to ensure that the apparent changes in size are above the noise floor of the system. By introducing a fiducial reference, it may be possible to detect smaller changes in le ...

24. Diffraction and Electron Energy Loss to Plasmons in Silicon Slabs
Published: 3/10/2008
Author: Zachary H Levine
Abstract: Dynamic diffraction patterns have been calculated for 25-nm thick slabs of silicon with [001], [111], and [110] faces for a 120 keV electron beam. The calculation used the mixed dynamical form factor in the dielectric formulation. Dielectric matric ...

25. The Magic Angle Mystery in Electron Energy Loss Spectra: Relativistic and Dielectric Corrections
Published: 1/2/2008
Authors: A P Sorini, J J Rehr, Zachary H Levine
Abstract: Recently it has been demonstrated that a careful treatment of both longitudinal and transverse matrix elements in electron energy loss spectra can explain the mystery of relativistic effects on the magic angle. Here we show that there is an addition ...

26. Controlling the Band Gap in Zigzag Graphene Nanoribbons With an Electric Field Induced by a Polar Molecule
Published: 1/1/2008
Authors: Sergio Dalosto, Zachary H Levine
Abstract: Graphene nanoribbons with both armchair- and zigzag-shaped hydrogen-passivated edges (AGNR and ZGNR) have band gaps. Son et al. showed that the gap s value depends on the width of the ribbon and that the application of a uniform external electric fi ...

27. Optical to UV spectra and birefringence of SiO2 and TiO2:  first-principles calculations with excitonic effects
Published: 1/1/2008
Authors: H M Lawler, J J Rehr, F Vila, SD Dalosto, Eric L Shirley, Zachary H Levine
Abstract: A first-principles approach is presented for calculations of optical to ultraviolet spectra including excitonic effects.  The approach is based on the Bethe-Salpeter equation calculations using the NBSE code combined with ABINIT.  The appro ...

28. Synthetic Incoherence for Electron Microscopy
Published: 7/11/2007
Authors: Zachary H Levine, Robyn M Dunstan
Abstract: Tomographic studies of submicrometer samples in materials science using electron microscopy have been inhibited by diffraction effects. In the present work, we describe two practical methods for ameliorating these effects. In one, the sample is sca ...

29. Alignment of Fiducial Marks in a Tomographic Tilt Series with an Unknown Rotation Axis
Published: 4/1/2007
Authors: Zachary H Levine, Peter Volkovitsky, Howard Hung
Abstract: Alignment for tomography using a transmission electron microscopy frequently uses colloidal gold particles as fiducial reference marks. Typically, there is an implicit assumption that the tilt axis of the tomographic series is orthogonal to the beam ...

30. Bayesian Tomography for Projections With an Arbitrary Transmission Function With an Application in Electron Microscopy
Series: Journal of Research (NIST JRES)
Published: 12/1/2006
Authors: Zachary H Levine, Anthony J Kearsley, John G Hagedorn
Abstract: The vast majority of the developments in tomography assume that the transmission of the probe trhought he sample follows Beer s Law, i.e., the rule of exponential attenuation. However, for transmission electron microscopy of samples a few times thei ...

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