Gunnar Thorkildsen

Ekstern tilknyttet UiS

Gunnar Thorkildsen

Contact

Telephone: 51831857

Email: gunnar.thorkildsen@uis.no

Room: KE E-533

Department

Faculty of Science and Technology

Department of Mathematics and Physics

Publications

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 80.

Hefte 1.

s.129-136.

DOI: 10.1107/S2053273323010550

(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;