Ondrej Krivanek

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Ondrej Krivanek 2020

Ondrej Ladislas Krivanek (born August 1, 1950 in Prague as Ondřej Ladislav Křivánek) is a British physicist of Czech descent who is known for developments in electron microscopy .

life and work

Krivanek went to school in Prague and fled to Great Britain after the Prague Spring in 1968. He studied at Leeds University (Bachelor's degree in 1971) and received his doctorate in physics from Cambridge University under Archie Howe in 1976, while researching at the Cavendish Laboratory in 1975/76 . In 1975 he became a British citizen. As a post-doctoral student he was at the University of Kyoto , the Bell Laboratories (1976/77) and the University of California, Berkeley (1977 to 1980). There he made one of the first electron microscope images of grain boundaries of semiconductors and contact surfaces of semiconductor components in atomic resolution.

He began to be interested in electron energy loss spectroscopy (EELS, EEL) in the late 1970s and built the first spectrometers and filters for it, which eventually became widespread. He was Assistant Professor at Arizona State University (HREM Facility) from 1981 to 1985 and was a consultant to Gatan, whose Research Director he became in 1985, and from 1985 to 1997 he was also an Adjunct Associate Professor at Arizona State University. After he had difficulty developing research funds in the USA for the development of filters to correct aberration in the electron lenses in scanning transmission electron microscopes (STEM), he went to Cambridge University in 1995, for which he had received funds from the Royal Society. There he worked with Mick Brown and Andrew Bleloch . In 1997 he and Niklas Dellby founded the company Nion, of which he became president and which supplied the first commercially available aberration correctors for electron microscopes. In addition to serving as President of Nion, he is an Affiliate Professor at Arizona State University.

With Channing Ahn he is the author of the EELS Atlas, a standard work.

He developed methods for diagnosis and filters and software for the correction of aberration up to the third order in electron microscopes, software for electron microscopes (digital micrograph) and CCD cameras for slow scanning for electron microscopy.

With Phil Batson of the IBM Thomas Watson Research Center he achieved sub-Angstrom resolution thanks to his aberration corrections up to the 3rd order with a STEM, published in Nature 2002. The devices also provided the first direct electron microscopic sub-Angstrom images at the Oak Ridge National Laboratory of crystal lattices and EEL spectra of individual atoms in solids. The company also developed STEM for chemical analysis at the atomic level. In 2013, the company introduced a monochromator for STEM, which for the first time enabled phonon or vibration spectroscopy in an electron microscope, with the energy resolution finally reaching a few meV at a voltage of 20 kV. With improved EEL spectrometers, this enabled the non-destructive investigation of biological materials (in this case guanine ) with electron microscopes using phonon or vibration spectroscopy, whereby different environments of hydrogen atoms could be detected and individual isotopes of the carbon of an amino acid in atomic resolution.

With this technique, FS Hage and colleagues achieved the demonstration of atomic resolution with a phonon signal in 2019 and the detection of a vibration signal of a single silicon atom in 2020.

Awards and memberships

In 2010 he received the Kavli Prize in Nanosciences and became a Fellow of the Royal Society . In 2014 he became an Honorary Fellow of the Royal Microscopical Society , Fellow of the Microscopy Society of America and he is a Fellow of the American Physical Society (2013). He received the Duddell Medal of the Institute of Physics and the Cosslett Medal of the International Federation of Microscopy Societies .

literature

  • Tracy Lovejoy, Peter Rez, Niklas Dellby: Ondrej Krivanek: A pioneering visionary in electron microscopy , Ultramicroscopy, Volume 180, September 2017, pp. 2–7

Web links

Commons : Ondřej Křivánek  - collection of pictures, videos and audio files

Individual evidence

  1. ↑ a b c Birth and career dates Pamela Kalte u. a. American Men and Women of Science , Thomson Gale 2009
  2. ↑ Krivanek, High resolution imaging of grain boundaries and interfaces , Proceedings of Nobel Symposium 47, Chemica Scripta, Volume 14, 1978, p. 213.
  3. ↑ CC Ahn, OL Krivanek, EELS Atlas - a reference guide of electron energy loss spectra covering all stable elements , ASU HREM Facility & Gatan Inc., Warrendale, PA, 1983
  4. ↑ PE Batson, N. Dellby, OL Krivanek, Sub-Ångstrom resolution using aberration corrected electron optics , Nature, Volume 418, 2002, p. 617
  5. ↑ PD Nellist, MF Chisholm, N. Dellby, OL Krivanek, MF Murfitt, ZS Szilagyi, AR Lupini, A. Borisevich, WH Sides, SJ Pennycook: Direct sub-Ångstrom imaging of a crystal lattice , Science, Volume 305, 2004, P. 1741.
  6. ↑ M. Varela, SD Findlay, AR Lupini, HM Christen, AY Borisevich, N. Dellby, OL Krivanek, PD Nellist, MP Oxley, LJ Allen, SJ Pennycook, Spectroscopic Imaging of Single Atoms Within a Bulk Solid , Phys. Rev. Lett., Vol. 92, 2004, p. 095502.
  7. ^ DA Muller, L. Fitting Kourkoutis, MF Murfitt, JH Song, HY Hwang, J. Silcox, N. Dellby, OL Krivanek, Atomic-Scale Chemical Imaging of Composition and Bonding by Aberration-Corrected Microscopy , Science, Volume 319, 2008 , P. 1073
  8. ↑ OL Krivanek, MF Chisholm, V. Nicolosi, TJ Pennycook, GJ Corbin, N. Dellby, MF Murfitt, CS Own, ZS Szilagyi, MP Oxley, ST Pantelides, SJ Pennycook: Atom-by-atom structural and chemical analysis by annular dark field electron microscopy , Nature, Volume 464, 2010, p. 571.
  9. ↑ Krivanek, Dellby, Batson, Crozier, and others. a., Vibrational spectroscopy in the electron microscope , Nature, Volume 514, 2014, pp. 209-212
  10. ↑ , Rez, Krivanek, Dellby, Cohen, and others. a., Damage-free vibrational spectroscopy of biological materials in the electron microscope , Nature Communications, Volume 7, 2016, p. 10945. PMID 26961578
  11. ↑ Hachtel, Krivanek et al. a .: Identification of site-specific isotopic labels by vibrational spectroscopy in the electron icroscope , Science, Volume 363, 2019, pp. 525-528, abstract
  12. ↑ FS Hage, D. M. Kepaptsoglou, Q. M. Ramasse, L. J. Allen. Phonon Spectroscopy at Atomic Resolution , Phys. Rev. Lett., Volume 122, 2019, p. 016103, abstract
  13. ↑ FS Hage, G. Radtke, DM Kepaptsoglou, M. Lazzeri, QM Ramasse, single-atom vibrational spectroscopy in the scanning transmission electron microscope , Science, Volume 367, 2020, pp. 1124-1127
personal data
SURNAME Krivanek, Ondrej
ALTERNATIVE NAMES Křivánek, Ondřej Ladislav
BRIEF DESCRIPTION Czech-British physicist
DATE OF BIRTH August 1, 1950
PLACE OF BIRTH Prague