Gunnar Thorkildsen

Ekstern tilknyttet UiS

Gunnar Thorkildsen
51831857
Det teknisk-naturvitenskapelige fakultet
Institutt for matematikk og fysikk
KE E-533
Publikasjoner
Tilbake
  • Vitenskapelige publikasjoner

    • Thorkildsen, Gunnar

      (2024)

      Analytical models representing X-ray form factors of ions.

      Acta Crystallographica Section A: Foundations and Advances.

      ISSN 2053-2733.

      Volum 18.

      Hefte 1.

      s.57-78.

      DOI: 10.1107/S2053273323010550

    • Thorkildsen, Gunnar

      (2023)

      New benchmarks in the modelling of X-ray atomic form factors.

      Acta Crystallographica Section A: Foundations and Advances.

      ISSN 2053-2733.

      Volum 79.

      s.318-330.

      DOI: 10.1107/S2053273323003996

    • Ramsnes, Stian Penev; Larsen, Helge Bøvik; Thorkildsen, Gunnar

      (2020)

      MaXrd updated with emphasis on model construction and reciprocal-space simulations.

      Journal of Applied Crystallography.

      ISSN 0021-8898.

      Volum 53.

      Hefte 6.

      s.1620-1624.

      DOI: 10.1107/S160057672001328X

    • Zhang, Qiuyuan; Polikarpov, Maxim; Nataliya, Klimova; Larsen, Helge Bøvik; Mathiesen, Ragnvald; Emerich, Hermann; Thorkildsen, Gunnar; Snigireva, Irina; Snigirev, Anatoly

      (2019)

      Investigation of glitches induced by single-crystal diamond compound refractive lenses based on crystal orientation.

      AIP Conference Proceedings.

      ISSN 0094-243X.

      Volum 2054.

      Hefte 1.

      s.1-6.

      DOI: 10.1063/1.5084638

    • Ramsnes, Stian Penev; Larsen, Helge Bøvik; Thorkildsen, Gunnar

      (2019)

      Using Mathematica as a platform for crystallographic computing.

      Journal of Applied Crystallography.

      ISSN 0021-8898.

      Volum 52.

      s.214-218.

      DOI: 10.1107/S1600576718018071

    • Zhang, Qiuyuan; Polikarpov, Maxim; Klimova, Nataliya; Larsen, Helge Bøvik; Mathiesen, Ragnvald; Emerich, Hermann; Thorkildsen, Gunnar; Snigireva, Irina; Snigirev, Anatoly

      (2018)

      Investigation of `glitches' in the energy spectrum induced by single-crystal diamond compound X-ray refractive lenses.

      Journal of Synchrotron Radiation.

      ISSN 0909-0495.

      Volum 26.

      s.1-10.

      DOI: 10.1107/S1600577518014856

    • Larsen, Helge Bøvik; Thorkildsen, Gunnar; Nicholson, David Graham; Pattison, Philip

      (2016)

      Thermal induced structural properties of silver(I) sulphate (Ag2SO4).

      Crystal Research & Technology.

      ISSN 0232-1300.

      Volum 51.

      Hefte 12.

      s.730-737.

      DOI: 10.1002/crat.201600173

    • Larsen, Helge Bøvik; Thorkildsen, Gunnar; Natland, Sølvi; Pattison, Philip

      (2014)

      Average crystal structure(s) of the embedded meta stable η′-phase in the Al-Mg-Zn system.

      Philosophical Magazine.

      ISSN 1478-6435.

      Volum 94.

      Hefte 15.

      s.1719-1743.

      DOI: 10.1080/14786435.2014.895440

    • Thorkildsen, Gunnar; Larsen, Helge Bøvik

      (2014)

      Crystallography of embedded particles in Al-Mg-Zn alloys. Symmetry analysis.

      Journal of Applied Crystallography.

      ISSN 0021-8898.

      Volum 47.

      Hefte 5.

      s.1736-1748.

      DOI: 10.1107/S1600576714019414

    • Larsen, Helge Bøvik; Thorkildsen, Gunnar; Nicholson, David Graham

      (2012)

      X-ray attenuation factors in fluorescence intensity emission-effects of finite sample size.

      Physica Scripta.

      ISSN 0031-8949.

      Volum 86.

      Hefte 6.

      DOI: 10.1088/0031-8949/86/06/065601

    • Sjølyst-Kverneland, Atle; Hansen, Vidar; Thorkildsen, Gunnar; Larsen, Helge Bøvik; Pattison, P; Li, X.Z.; Gjønnes, Jon

      (2011)

      Transformations and structures in the Al-Zn-Mg alloy system: A diffraction study using synchrotron radiation and electron precession.

      Materials Science & Engineering: A.

      ISSN 0921-5093.

      Volum 528.

      Hefte 3.

      s.880-887.

      DOI: 10.1016/j.msea.2010.10.001

    • Sjølyst-Kverneland, Atle; Hansen, Vidar; Thorkildsen, Gunnar; Larsen, Helge Bøvik; Pattison, Philip; Li, XZ; Gjønnes, Jon

      (2010)

      Transformations and structures in the Al?Zn?Mg alloy system: A diffraction study using synchrotron radiation and electron precession.

      Materials Science & Engineering: A.

      ISSN 0921-5093.

      DOI: 10.1016/j.msea.2010.10.001

    • Thorkildsen, Gunnar; Larsen, Helge Bøvik; Beukes, Jon Are

      (2006)

      Angle calculations for a three-circle goniostat.

      Journal of Applied Crystallography.

      ISSN 0021-8898.

      Volum 39.

    • Thorkildsen, Gunnar; Weckert, Edgar; Mo, Frode; Larsen, Helge Bøvik; Mathiesen, Ragnvald

      (2005)

      Three-beam resonant X-ray diffraction in germanium - Laue transmission cases.

      Acta Crystallographica Section A: Foundations of Crystallography.

      ISSN 0108-7673.

      Volum 61.

      s.460-470.

    • Larsen, Helge Bøvik; Thorkildsen, Gunnar; Weckert, Edgar

      (2005)

      Three-beam diffraction in an elastically strained crystal plate.

      Acta Crystallographica Section A: Foundations of Crystallography.

      ISSN 0108-7673.

      Volum 61.

      s.134-138.

    • Thorkildsen, Gunnar; Larsen, Helge Bøvik; Weckert, Edgar; Semmingsen, Dag

      (2003)

      Three-beam X-ray diffraction -- profile analysis.

      Journal of Applied Crystallography.

      ISSN 0021-8898.

      Volum 36.

      s.1324-1333.

    • Thorkildsen, Gunnar; Larsen, Helge Bøvik

      (2002)

      Three-beam X-ray diffraction in a semi-infinite perfect crystal.

      ?.

      Volum 58.

      s.252-258.

    • Thorkildsen, Gunnar; Larsen, Helge Bøvik; Semmingsen, Dag; Bjaanes, Øystein

      (2001)

      Generalized extinction in bipyramidal crystals.

      ?.

      Volum 57.

      s.201-211.

    • Thorkildsen, Gunnar; Larsen, Helge Bøvik; Weckert, Edgar

      (2001)

      Approximate solution of the Takagi-Taupin equations for a semi-infinite crystal in the three-beam Laue-Laue case.

      ?.

      Volum 57.

      s.389-394.

    • Thorkildsen, Gunnar; Larsen, Helge B.; Mathiesen, Ragnvald H.; Mo, Frode

      (2000)

      Three-beam interference measurements with a six-circle kappa diffractometer.

      Journal of Applied Crystallography.

      ISSN 0021-8898.

      Volum 33.

      s.49-51.

    • Thorkildsen, Gunnar; Larsen, Helge B.

      (2000)

      Comments on Extinction-Corrected mean thickness and integral width used in the program UMWEG98 by Rossmanith (2000).

      Journal of Applied Crystallography.

      ISSN 0021-8898.

      Volum 33.

    • Thorkildsen, Gunnar; Mathiesen, Ragnvald H.; Larsen, Helge B.

      (1999)

      Angle calculations for a six-circle kappa diffractometer.

      Journal of Applied Crystallography.

      ISSN 0021-8898.

      Volum 32.

      s.943-950.

    • Thorkildsen, Gunnar; Larsen, Helge B.; Authier, Andre

      (1999)

      Nonsymmetrical X-ray diffraction in a perfect rectangular t x l crystal. Extinction and absorption.

      ?.

      Volum A55.

      Hefte 1.

      s.1-13.

    • Thorkildsen, Gunnar; Larsen, Helge Bøvik

      (1999)

      X-ray diffraction in perfect t x l crystals. Rocking curves.

      ?.

      Volum A55.

      s.840-854.

    • Thorkildsen, Gunnar; Larsen, Helge Bøvik

      (1999)

      X-ray intensity patterns from finite perfect crystals.

      ?.

      Volum A55.

      s.1000-1013.

    • Thorkildsen, Gunnar; Larsen, Helge B.; Authier, Andre

      (1998)

      Three-Beam Diffraction in Finite Perfect Crystals. I: Exploring Laue-Laue and Bragg-Laue Scattering Using a Series-Expansion Approach for the Solution of the Takagi-Taupin Equations.

      ?.

      Volum A54.

      Hefte 1.

      s.120-128.

    • Larsen, Helge B.; Thorkildsen, Gunnar; Authier, Andre

      (1998)

      Three-Beam Diffraction in Finite Perfect Crystals. II. Influence of Absorption, Resonant Scattering and Polarization.

      ?.

      Volum A54.

      Hefte 1.

      s.129-136.

    • Larsen, Helge B.; Thorkildsen, Gunnar; Authier, Andre

      (1998)

      Three-Beam Diffraction in Finite Imperfect Crystals. An Analysis of Coherent Wavefield Interactions Using Statistical Dynamical Theory.

      ?.

      Volum A54.

      Hefte 1.

      s.137-145.

    • Thorkildsen, Gunnar; Larsen, Helge B.; Authier, Andre

      (1998)

      Primary Extinction in Cylinders and Spheres.

      ?.

      Volum A54.

      s.172-185.

    • Thorkildsen, Gunnar; Larsen, Helge B.; Authier, Andre

      (1998)

      Absorption and Weighted Path Lengths in Cylinders and Spheres.

      ?.

      Volum A54.

      s.186-190.

    • Thorkildsen, Gunnar; Larsen, Helge B.; Authier, Andre

      (1998)

      Symmetrical X-ray Diffraction in a Perfect Rectangular t x l Crystal. Extinction and Absorption.

      ?.

      Volum A54.

      s.416-429.

    • Larsen, Helge B.; Thorkildsen, Gunnar; Authier, Andre

      (1998)

      An exact analytical expression for the primary extinction factor for a perfect spherical crystal in the limit oh->/2.

      ?.

      Volum A54.

      s.511-512.

    • Svare, Ivar; Thorkildsen, Gunnar; Andersson, H.I.; Skjæveland, Svein Magne; Trivijitkasem, P.

      (1978)

      Proton Relaxation by Tunneling in Ammonium Salts at Low Temperature.

      Journal of Physics C: Solid State Physics.

      ISSN 0022-3719.

  • Bøker og kapitler

    • Thorkildsen, Gunnar; Larsen, Helge Bøvik

      (2007)

      Crystallography of embedded particles in FCC metal matrices.

      Universitetet i Stavanger.

      ISBN 9788276443325.

      Hefte No. 24.

    • Thorkildsen, Gunnar; Larsen, Helge Bøvik; Beukes, Jon Are

      (2005)

      Angle Calculations for a Six Circle Kappa-Diffractometer IV Orientation Matrix.

      Universitetet i Stavanger.

      ISBN 8276442544.

      Hefte 2.

    • Thorkildsen, Gunnar; Larsen, Helge Bøvik; Beukes, Jon Are

      (2004)

      Angle Calculations for a six circle kappa-diffractometer. III. psi-rotations and scan procedures.

      ISBN 8276442153.

      Hefte 131.

    • Thorkildsen, Gunnar; Larsen, Helge Bøvik

      (2002)

      Angle Calculations for a Six Circle Kappa-Diffractometer II. General Orientation of Axes.

      Universitetet i Stavanger.

      ISBN 8276441858.

      Hefte 110.

    • Thorkildsen, Gunnar; Larsen, Helge B.

      (1999)

      Two Beam Diffraction in Perfect Crystals analyzed by Takagi's Equations. Part 4. Rocking Curves. Mathematica Function Definitions and Notebooks.

      Universitetet i Stavanger.

      ISBN 82-7644-074-6.

      Hefte 53.

    • Thorkildsen, Gunnar; Larsen, Helge B.; Mathiesen, Ragnvald H.; Mo, Frode

      (1998)

      Test Experiments with the KUMA6 Diffractometer at the SNBL, EH-2. Project 01-02-115.

    • Thorkildsen, Gunnar; Mathiesen, Ragnvald H.; Larsen, Helge B.

      (1998)

      Angle Calculations for a Six-Circle kappa-Diffractometer.

      Universitetet i Stavanger.

      ISBN 82-7644-065-7.

      Hefte 46.

    • Thorkildsen, Gunnar; Larsen, Helge B.

      (1998)

      Three-beam Diffraction in Imperfect Crystals.

      Universitetet i Stavanger.

      ISBN 82-7644-052-5.

      Hefte 40.

    • Thorkildsen, Gunnar; Larsen, Helge B.

      (1998)

      Two Beam Diffraction in Perfect Crystals Analyzed by Takagi's Equations. Part 3. Rocking Curves and Intensity Distributions.

      Universitetet i Stavanger.

      ISBN 82-7644-056-8.

    • Thorkildsen, Gunnar; Larsen, Helge Bøvik

      (1997)

      Two Beam Diffraction in Perfect Crystals Analyzed by Takagi's Equations. Part 1-Basic Principles and Methods of Solutions.

      Universitetet i Stavanger.

      ISBN 82-7644-040-1.

      Hefte 30.

    • Thorkildsen, Gunnar; Larsen, Helge Bøvik

      (1997)

      Two Beam Diffraction in Perfect Crystals Analyzed by Takagi's Equations. Part 2-Function Definitions, Notebooks and Worksheets.

      Universitetet i Stavanger.

      ISBN 82-7644-042-8.

      Hefte 31.

  • Formidling

    • Ramsnes, Stian Penev; Larsen, Helge Bøvik; Thorkildsen, Gunnar; Nicholson, David Graham

      (2019)

      Utilising MaXrd in the Study of Inclusion Compounds.

      32nd European Crystallographic Meeting;

      2019-08-18 - 2019-08-23.

    • Thorkildsen, Gunnar; Larsen, Helge Bøvik

      (2015)

      The atomic anisotropic displacement tensor - completing the picture.

      Acta Crystallographica Section A: Foundations and Advances.

      ISSN 2053-2733.

      Volum 71.

      s.467 -470.

      DOI: 10.1107/S2053273315008372

    • Hansen, Vidar; Oddsen, Ingunn Cecilie; Kverneland, Atle; Larsen, Helge Bøvik; Pattison, Philip; Thorkildsen, Gunnar; Gjønnes, Jon

      (2009)

      Diffuse scattering from zones and particles in the Al-Zn-Mg alloy system.

      SNBL/ESRF Workshop on Diffuse Scattering;

      2009-06-25 - 2009-06-26.

    • Natland, Sølvi; Larsen, Helge Bøvik; Thorkildsen, Gunnar; Pattison, Philip

      (2008)

      Diffraction studies of an Al-Mg-Zn single crystal by synchrotron radiation.

      XXI Congress of the International Union of Crystallography;

      2008-08-23 - 2008-08-31.

    • Hansen, Vidar; Kverneland, Atle; Li, X.Z.; Thorkildsen, Gunnar; Larsen, Helge Bøvik; Gjønnes, Jon

      (2008)

      Elektronmikroskopi og synkrotronrøntgen diffraksjonsstudier av transformasjoner og strukturer i 7xxx-legeringer.

      29. Metallurgiske Sommermøtet;

      2008-05-21 - 2008-05-22.

    • Hansen, Vidar; Kverneland, Atle; Thorkildsen, Gunnar; Larsen, Helge Bøvik; Vincent, Roger; Gjønnes, Jon

      (2007)

      Structure analysis of the n'-precipitate in Al-Zn-Mg alloys by the precession technique in electron diffraction and synchrotron radiation.

      19Th Nordic Structural Chemistry Meeting;

      2007-01-08 - 2007-01-11.

    • Hansen, Vidar; Kverneland, Atle; Thorkildsen, Gunnar; Larsen, Helge Bøvik; Pattison, Philip; Gilmore, Cristopher; Vincent, Roger; Gjønnes, Jon

      (2006)

      Structure determination of nanosized semi-coherent Al-Mg-Zn precipitates by precession electron diffraction and synchrotron X-ray diffraction.

      23rd European crystallographic Meeting;

      2006-08-06 - 2006-08-11.

    • Larsen, Helge Bøvik; Thorkildsen, Gunnar

      (2004)

      Kappa six circle diffractometer -- benchmarking.

      utenTitteltekst;

      2004-05-10.

    • Larsen, Helge Bøvik; Thorkildsen, Gunnar

      (2004)

      Three-beam diffraction in imperfect crystals.

      utenTitteltekst;

      2004-06-23.

    • Larsen, Helge Bøvik; Thorkildsen, Gunnar

      (2004)

      Multiple beam diffraction -- the basics, applications and possible developments.

      utenTitteltekst;

      2004-12-06.

    • Thorkildsen, Gunnar

      (2004)

      Fysikklaboratorium -- Forelesningsnotater.

    • Larsen, Helge Bøvik; Thorkildsen, Gunnar

      (2003)

      Three-beam X-ray diffraction -- profile analysis.

      21st EUROPEAN Crystallographic Meeting.;

      2003-08-24 - 2003-08-29.

    • Thorkildsen, Gunnar; Larsen, Helge Bøvik

      (2002)

      TE-6254 Materialfysikk.

      Universitetet i Stavanger.

    • Larsen, Helge Bøvik; Thorkildsen, Gunnar

      (2001)

      Three-beam Diffraction -- Only for Phase-Estimation??.

      11'th ESRF User's Meeting;

      2001-02-19 - 2001-02-20.

    • Thorkildsen, Gunnar; Larsen, Helge Bøvik

      (2001)

      Dynamical scattering of X-rays in finite crystals.

      1. Brukermøte norsk Synktrotronforskning;

      2001-01-18 - 2001-01-19.

    • Larsen, Helge Bøvik; Thorkildsen, Gunnar

      (2001)

      Three-beam Diffraction -- Only for Phase-Estimation ???.

      1.Brukermøte norsk Synkrotronforskning;

      2001-01-18 - 2001-01-19.

    • Thorkildsen, Gunnar

      (2001)

      Spredning av røntgenstråler i krystaller.

      utenTitteltekst;

      2001-03-08.

    • Larsen, Helge B.; Thorkildsen, Gunnar

      (2000)

      Measurements of dynamical diffraction effects in finite crystals.

      SNBL -user's meeting No.1. Research highlights.;

    • Thorkildsen, Gunnar

      (1999)

      X-ray diffraction in finite perfect crystals.

      utenTitteltekst;

    • Larsen, Helge Bøvik; Thorkildsen, Gunnar

      (1999)

      Interference Patterns from semi-infinite and finite Crystals.

      utenTitteltekst;

    • Thorkildsen, Gunnar; Larsen, Helge B.

      (1998)

      Polarization Effects in Three-Beam Diffraction from Small, Finite Crystals.

      International School of Crystallography;

    • Thorkildsen, Gunnar; Larsen, Helge B.

      (1998)

      Calculating the Integrated Power as a Function of Wavelenght for a Finite Perfect Crystal using MATHEMATICA.

      International School of Crystallography;

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