Zobrazeno 1 - 10 of 24 pro vyhledávání: '"Dag Semmingsen"'
1
Three-beam X-ray diffraction – profile analysis
Autor: Gunnar Thorkildsen, Dag Semmingsen, Helge B. Larsen, Edgar Weckert
Publikováno v: Journal of Applied Crystallography. 36:1324-1333
An original functional description of the intensity perturbation of the two-beam diffracted power caused by an interfering three-beam interaction has been developed. By using this approach in the analysis of measured three-beam profiles of α-oxalic
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::781dfd75d4ef9fe9fb82d9a6e3c5cc73
https://doi.org/10.1107/s0021889803016145
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9
A structural phase transition in squaric acid
Autor: Jens Feder, Dag Semmingsen
Publikováno v: Solid State Communications. 15:1369-1372
Squaric acid (3,4-dihydroxy-3-cyclobutene-1,2-dione) is found to undergo a second order antiferrodistortive tetragonal to monoclinic phase transition at 97.7°C. The transition temperature for the fully deuterated compound is 243°C. The crystals are
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9a722e405d1034b9e9ad061e2cfb3bee
https://doi.org/10.1016/0038-1098(74)91382-9
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10
The phase transition of two-dimensional squaric acid H2C4O4 studied by neutron scattering
Autor: Dag Semmingsen, Emil J. Samuelsen
Publikováno v: Journal of Physics and Chemistry of Solids. 38:1275-1283
At Tc = 370 K squaric acid undergoes a phase transition, which was studied in detail by neutron scattering. The transition is essentially two-dimensional with β = 0.137 ± 0.010. Diffuse scattering above Te is found to be anisotropic. From “diffus
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d39736bea0d8aa3188371712f91cf1dd
https://doi.org/10.1016/0022-3697(77)90028-2
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