Pole-figure scans

Figure 4 is a set of contour plots of data derived from three Standard Pole Figure scans on a highly oriented specimen of linear polyethylene. The contour plotting software establishes a set of intensity levels that span the data in the diffraction data file. 

There are three subroutines for making contour plots using various map projections and a subroutine for making x-y plots. The contour plotting routines are used with the Standard Pole Figure and Area Scan diffraction data files, while the x-y plot is used for data from x scans, scans, 28 scans, and layer line plots. 

Figure 9.3. Scattering geometry for the measurement of pole figures in a texture goniometer. The scattering angle 20/,/./ is fixed, (p and (// are scanned...

The electrodeposited precursor films, annealed in air at 870 °C in the presence of a TBSBCCO pellet, produce a biaxial textured Tl-1223 phase, as confirmed by an XRD pole-figure measurement. The omega and phi scans indicate full-width at half-maximum (FWHM) values of only 0.92° and 0.6°, respectively, which indicates a very high-quality film. The superconductive transition temperature of the Tl-1223 film, determined resistively, was about 110 K. Figure 7.11... 

In more recent work, talc-filled polystyrene compounds, with various filler volume fractions, have been processed by compression moulding and through a variety of slit, capillary, rectangular and annular dies [37]. Particle orientation has been characterised using wide angle X-ray diffraction, then expressed in the form of pole figures, and by scanning electron microscopy. It was concluded that... 

Rubrene was purchased from Aldrich (elemental purity > 98%) and additionally purified by gradient sublimation Freshly cleaved mica (001) was used as substrate. Rubrene thin films were deposited by hot wall epitaxy in a vacuum chamber with a base pressure below 10 Pa at different deposition rates and substrate temperatures (Ts). Pole figures were measured with a Philips X pert x-ray diffractometer using CrKa radiation and a secondary side graphite monochromator. Specular scans were performed on a Bruker D8-Discover diffractometer using CuKa radiation. POWDER CELL and STEREOPOLE were used for the evaluation of the specular scans and simulation of pole figures. 

The two most common instruments for these experiments are a triple quadru-pole mass analyser [34] and a quadmpole time of flight (Q-TOF) spectrometer [35]. The triple quadmpole instrument comprises two conventional quadmpole analysers usually referred to as Q1 and Q3 separated by a third known as Q2, which acts as an ion-focusing device and a collision cell. All the scan modes below (Figure 6.13) can be carried out on a triple quadmpole instmment. 

Figure 9.14. The hourly scan pattern of COBE, WMAP and Planck from left to right. In each panel the anti-solar direction is in the center, and plus signs denote the North and South ecliptic poles. An equiangular azimuthal projection is used. COBE scanned this area in one orbit of about 103 minutes, WMAP scans its pattern every hour, while Planck spends several hours integrating on one scan circle of radius 70° radius shown offset from anti-Sun by a 15° precession angle.

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