Scatter slit variable

Figure 3.34. The set of x-ray powder diffraction patterns collected from the nearly spherical LaNi4 gsSno.is powder (see Figure 3.32, inset) on a Rigaku TTRAX rotating anode powder diffractometer using Mo Ka radiation. Goniometer radius R = 285 mm receiving slit RS = 0.03° flat specimen diameter d = 20 mm. Incident beam apertures were 0.05, 0.17, 0.25, 0.38, 0.5, 0.75, 1, 1.5, 2° and completely opened ( 5°), respectively. An automatic variable scatter slit was used to reduce the background. The data were collected with a fixed step A20 = 0.01°, and the sample was continuously spun during the data collection.

Figure 3.41. The schematic of goniometer optics during data collection employing variable divergence and scatter slits apertures, which enables one to maintain the irradiated area of the sample constant at any Bragg angle. DS - divergence slit, ScS - scatter slit, RS - receiving slit.

The besl isolation of radiant energy can he achieved with flame spectrometers that incorporate either a prism sir grating monochromator, those with prisms having variable gauged entrance and exii slits. Both these spectrometers provide a continuous selection of wavelengths with resolving power sufficient lo separate completely most of the easily excited emission lines, and afford freedom from scattered radiation sufficient lo minimize interferences. Fused silica or quartz optical components are necessary to permit measurements in Ihe ultraviolet portion of the spectrum below 350 nanometers Sec also Analysis (Chemical) Atomic Spectroscopy Photometers and Spectra Instruments. 

Figure 8 Schematic layout of a typical 90° Raman depolarization experiment showing the positions of the polarization analyzer and the scrambler. The analyzer may simply be a polaroid sheet, which can be rotated by 90° to allow the parallel ( ) and perpendicular ( ) components of the scattered light to pass through to the detector. The function of a scrambler is to change linear into circular polarization of the light entering the Raman spectrometer slit in order to avoid measurement errors due to the variable spectrometer transmittance of the light polarized in different directions...

Figure 3.13. The overall view of the goniostat of the Rigaku TTRAX rotating anode powder diffractometer with the horizontal goniometer axis, and synchronized rotations of both the x-ray source and detector arms. This goniometer is equipped with variable divergence, scatter and receiving slits, curved crystal monochromator, and scintillation detector. (Courtesy of Rigaku/MSC.)...

Fig. 2. The H2-machine of Moerkerken (1970). The beam is produced from a high pressure source (S) a skimmer (Sk) is placed 10 mm downstream to obtain a nearly monochromatic beam of high intensity the scatter-box (Sb) is surrounded by two pairs of coils to produce a B-field of variable orientation the beam passes through A-, C- and B-fields, which together with the slit D, function as the state selector in the C-field transitions can be induced by a r.f.-coil (RF) the detector slit (D2) is followed by a uhv-Penning detector (P). The numbers below indicate distances in mm.

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