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159. An optical configuration for fastidious STEM detector calibration and the effect of the objective-lens pre-field

Author

Jones, L, Varambhia, A, Sawada, H, and Nellist, PD

Subjects
Physics::Instrumentation and Detectors
Abstract

In the scanning transmission electron microscope, an accurate knowledge of detector collection angles is paramount in order to quantify signals on an absolute scale. Here we present an optical configuration designed for the accurate measurement of collection angles for both image-detectors and energy-loss spectrometers. By deflecting a parallel electron beam, carefully calibrated using a diffraction pattern from a known material, we can directly observe the projection-distortion in the post-specimen lenses of probe-corrected instruments, the 3-fold caustic when an image-corrector is fitted, and any misalignment of imaging detectors or spectrometer apertures. We also discuss for the first time, the effect that higher-order aberrations in the objective-lens pre-field has on such an angle-based detector mapping procedure.

Published
2018

160. Positive and negative regulation of carbon nanotube catalysts through encapsulation within macrocycles

Author

Blanco M., Nieto-Ortega B., De Juan A., Vera-Hidalgo M., López-Moreno A., Casado S., González L.R., Sawada H., González-Calbet J.M., Pérez E.M. and Funding from the European Union (ERC-Starting Grant: 307609 (to E.M.P.)), MINECO (Grants: CTQ2014-60541-P (to E.M.P.), JdC-2015-23531 postdoctoral fellowship (to B.N.-O.)), and the Comunidad de Madrid (Grant: MAD2D-CM program S2013/MIT-3007 (to E.M.P.)) is gratefully acknowledged. IMDEA Nanociencia acknowledges support from the 'Severo Ochoa' Programme for Centres of Excellence in R&D (MINECO, Grant SEV-2016-0686). The computational work was supported by the Campus de Excelencia Internacional UAM+CSIC. Additionally, we express our gratitude to the Supercomputing and Bioinnovation Center (SCBI) of the University of Malagá (Spain) for their support and resources. We thank the National Centre for Electron Microscopy (ICTS-CNME, Universidad Complutense) for electron microscopic facilities.

Published
2018

165. Controlled polarity of sputter-deposited aluminum nitride on metals observed by aberration corrected scanning transmission electron microscopy.

Author

Harumoto, T., Sannomiya, T., Matsukawa, Y., Muraishi, S., Shi, J., Nakamura, Y., Sawada, H., Tanaka, T., Tanishiro, Y., and Takayanagi, K.

Subjects
ALUMINUM nitride, METALS, SCANNING transmission electron microscopy, EPITAXY, INTERFACES (Physical sciences)
Abstract

The polarity determination process of sputter-deposited aluminum nitride (AlN) on metals has been analyzed using aberration corrected atomic resolution scanning transmission electron microscope. Direct growth of c-axis orientated AlN on face centered cubic metals (fcc) (111) with the local epitaxy has been observed, and the polarity was determined at the AlN/metal interface. We found that the AlN polarity can be controlled by the base metal layer: N-polarity AlN grows on Pt(111) while Al-polarity AlN forms on Al(111). Based on these results, the growth mechanism of AlN on metals is discussed. [ABSTRACT FROM AUTHOR]

Published
2013
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174. Characterisation of the Medipix3 detector for 60 and 80keV electrons

Author

Mir, J.A., Clough, R., MacInnes, R., Gough, C., Plackett, R., Shipsey, I., Sawada, H., MacLaren, I., Ballabriga, R., Maneuski, D., O'Shea, V., McGrouther, D., and Kirkland, A.I.

Subjects
Physics::Instrumentation and Detectors, Detectors and Experimental Techniques
Abstract

In this paper we report quantitative measurements of the imaging performance for the current generation of hybrid pixel detector, Medipix3, used as a direct electron detector. We have measured the modulation transfer function and detective quantum efficiency at beam energies of 60 and 80 keV. In single pixel mode, energy threshold values can be chosen to maximize either the modulation transfer function or the detective quantum efficiency, obtaining values near to, or exceeding those for a theoretical detector with square pixels. The Medipix3 charge summing mode delivers simultaneous, high values of both modulation transfer function and detective quantum efficiency. We have also characterized the detector response to single electron events and describe an empirical model that predicts the detector modulation transfer function and detective quantum efficiency based on energy threshold. Exemplifying our findings we demonstrate the Medipix3 imaging performance recording a fully exposed electron diffraction pattern at 24-bit depth together with images in single pixel and charge summing modes. Our findings highlight that for transmission electron microscopy performed at low energies (energies

Published
2016

180. Image transfer with spatial coherence for aberration corrected transmission electron microscopes

Author

Hosokawa, F., Sawada, H., Shinkawa, T., and Sannomiya, Takumi

Subjects
010302 applied physics, Physics, Microscope, Contrast transfer function, business.industry, Attenuation, Astrophysics::Instrumentation and Methods for Astrophysics, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Transfer function, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, law.invention, Optics, law, Transmission electron microscopy, 0103 physical sciences, Microscopy, Electron microscope, 0210 nano-technology, business, Instrumentation, Coherence (physics)
Abstract

The formula of spatial coherence involving an aberration up to six-fold astigmatism is derived for aberration-corrected transmission electron microscopy. Transfer functions for linear imaging are calculated using the newly derived formula with several residual aberrations. Depending on the symmetry and origin of an aberration, the calculated transfer function shows characteristic symmetries. The aberrations that originate from the field's components, having uniformity along the z direction, namely, the n-fold astigmatism, show rotational symmetric damping of the coherence. The aberrations that originate from the field's derivatives with respect to z, such as coma, star, and three lobe, show non-rotational symmetric damping. It is confirmed that the odd-symmetric wave aberrations have influences on the attenuation of an image via spatial coherence. Examples of image simulations of haemoglobin and Si [211] are shown by using the spatial coherence for an aberration-corrected electron microscope.

Published
2016

190. Transport and spatial energy deposition of relativistic electrons in copper-doped fast ignition plasmas

Author

Jarrott, L. C., primary, McGuffey, C., additional, Beg, F. N., additional, Solodov, A. A., additional, Theobald, W., additional, Qiao, B., additional, Stoeckl, C., additional, Betti, R., additional, Chen, H., additional, Delettrez, J., additional, Döppner, T., additional, Giraldez, E. M., additional, Glebov, V. Y., additional, Habara, H., additional, Iwawaki, T., additional, Key, M. H., additional, Luo, R. W., additional, Marshall, F. J., additional, McLean, H. S., additional, Mileham, C., additional, Patel, P. K., additional, Santos, J. J., additional, Sawada, H., additional, Stephens, R. B., additional, Yabuuchi, T., additional, and Wei, M. S., additional

Published
2017
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193. P3318Acute phase vascular healing after stent implantation for patients with acute coronary syndrome: comparison of stent coverage between SYNERGY and XIENCE at 2 weeks and 4 months after implantation

Author

Shimoda, M., primary, Ando, H., additional, Sawada, H., additional, Naitou, K., additional, Saka, Y., additional, Suzuki, A., additional, Sakurai, S., additional, Kurita, A., additional, Waseda, K., additional, Takashima, H., additional, and Amano, T., additional

Published
2017
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198. Collimated Propagation of Fast Electron Beams Accelerated by High-Contrast Laser Pulses in Highly Resistive Shocked Carbon

Author

Vaisseau, X., primary, Morace, A., additional, Touati, M., additional, Nakatsutsumi, M., additional, Baton, S. D., additional, Hulin, S., additional, Nicolaï, Ph., additional, Nuter, R., additional, Batani, D., additional, Beg, F. N., additional, Breil, J., additional, Fedosejevs, R., additional, Feugeas, J.-L., additional, Forestier-Colleoni, P., additional, Fourment, C., additional, Fujioka, S., additional, Giuffrida, L., additional, Kerr, S., additional, McLean, H. S., additional, Sawada, H., additional, Tikhonchuk, V. T., additional, and Santos, J. J., additional

Published
2017
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199. Calibration and characterization of a highly efficient spectrometer in von Hamos geometry for 7-10 keV x-rays

Author

Jarrott, L. C., primary, Wei, M. S., additional, McGuffey, C., additional, Beg, F. N., additional, Nilson, P. M., additional, Sorce, C., additional, Stoeckl, C., additional, Theoboald, W., additional, Sawada, H., additional, Stephens, R. B., additional, Patel, P. K., additional, McLean, H. S., additional, Landen, O. L., additional, Glenzer, S. H., additional, and Döppner, T., additional

Published
2017
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200. Experimental characterization of fast electron stopping power in dense media ranging from solid to warm and dense matter

Author

Santos, J, Hulin, S, Vauzour, B, Vaisseau, X, Batani, D, Bouilleaud, R, Deneuville, F, Dorchies, F, Feugeas, J, Fourment, C, D'Humieres, E, Nicolai, P, Tikhonchuk, V, Touati, M, Debayle, A, Honrubia, J, Gremillet, L, Ceccotti, T, Floquet, V, Benocci, R, Morace, A, Veltcheva, M, Volpe, L, Baton, S, Perez, F, Schlenvoigt, H, Yahia, V, Beg, F, Chawla, S, Jarrot, L, Peebles, J, Sawada, H, Sorokovikova, A, Wei, M, Fedosejevs, R, Kerr, S, Coury, M, Gray, R, Mckenna, P, Li, K, Davies, J, Rhee, Y, Mclean, H, Patel, P, Santos J. J., Hulin S., Vauzour B., Vaisseau X., Batani D., Bouilleaud R., Deneuville F., Dorchies F., Feugeas J. -L., Fourment C., D'Humieres E., Nicolai Ph., Tikhonchuk V. T., Touati M., Debayle A., Honrubia J. J., Gremillet L., Ceccotti T., Floquet V., Benocci R., Morace A., Veltcheva M., Volpe L., Baton S. D., Perez F., Schlenvoigt H. -P., Yahia V., Beg F. N., Chawla S., Jarrot L. C., Peebles J., Sawada H., Sorokovikova A., Wei M., Fedosejevs R., Kerr S., Coury M., Gray R., McKenna P., Li K., Davies J. R., Rhee Y., McLean H., Patel P., Santos, J, Hulin, S, Vauzour, B, Vaisseau, X, Batani, D, Bouilleaud, R, Deneuville, F, Dorchies, F, Feugeas, J, Fourment, C, D'Humieres, E, Nicolai, P, Tikhonchuk, V, Touati, M, Debayle, A, Honrubia, J, Gremillet, L, Ceccotti, T, Floquet, V, Benocci, R, Morace, A, Veltcheva, M, Volpe, L, Baton, S, Perez, F, Schlenvoigt, H, Yahia, V, Beg, F, Chawla, S, Jarrot, L, Peebles, J, Sawada, H, Sorokovikova, A, Wei, M, Fedosejevs, R, Kerr, S, Coury, M, Gray, R, Mckenna, P, Li, K, Davies, J, Rhee, Y, Mclean, H, Patel, P, Santos J. J., Hulin S., Vauzour B., Vaisseau X., Batani D., Bouilleaud R., Deneuville F., Dorchies F., Feugeas J. -L., Fourment C., D'Humieres E., Nicolai Ph., Tikhonchuk V. T., Touati M., Debayle A., Honrubia J. J., Gremillet L., Ceccotti T., Floquet V., Benocci R., Morace A., Veltcheva M., Volpe L., Baton S. D., Perez F., Schlenvoigt H. -P., Yahia V., Beg F. N., Chawla S., Jarrot L. C., Peebles J., Sawada H., Sorokovikova A., Wei M., Fedosejevs R., Kerr S., Coury M., Gray R., McKenna P., Li K., Davies J. R., Rhee Y., McLean H., and Patel P.

Published
2012

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