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Normalized x-ray absorption coefficient from (a) powder and (b),(c) coaxial heterostructures as a function of incident x-ray energy at the Ga edge and . For the coaxial structures, the XAFS data were collected with the geometry of the axis aligned, (b) parallel and (c) perpendicular, to the electric field vector of the incident x rays.
XAFS from powder (top) and from the aligned coaxial structures with thickness of 6 and for (2nd and 3rd) and (4th and 5th), as a function of the photoelectron wave vector, , where is the electron rest mass, is the incident photon energy and is the edge energy.
Magnitude of Fourier transformed XAFS, from (a) powder and coaxial structures with an average thickness of for (b) and (c) , as a function of the distance from a Ga atom. For the Fourier transformation, a Hanning window with a window sill width of was used. Data in the range of were fitted.
Coordination number , bond length and Debye–Waller factor of powder and tubular were obtained with XAFS at . of 0.85(5) were determined from the fit to the powder data and fixed in the tubular data fits. For the model calculations, the WZ structure with , and the crystalline symmetry of nitrogen = 0.375 were used. For the ZB structure, the lattice constant of was used.
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