Rocking scan

Figure 3.17. (a) Specular X-ray intensity of a DIP trim with 20.6 nm thickness. Bragg reflections up to the seventh order are seen, (b) Magnification of the specular scan from the region of total external reflection across the first specular DIP Bragg reflection. The inset displays a rocking scan across the DIP(OOl) reflection which exhibits FWHM as small as 0.0087°. Reprinted with permission from A. C. Diirr, F. Schreiber, M. Mtinch, N. Karl, B. Krause, V. Kruppa and H. Dosch. Applied Physics Letters, 81, 2276 (2002). Copyright 2002, American Institute of Physics. 

An azimuthal, also known as a 0 or rocking scan, involves measuring the intensity along an azimuthal arc at constant Q. Experimentally, it involves rotating the circle while maintaining 0 and 26 constant. These measurements are usually employed in determining the symmetry of an overlayer. 

Figure 41. Crystal truncation rod for a silver(l 11) electrode/solution interface, (a) radial scan, (b) azimuthal (rocking) scan, (c) crystal truncation rod scan. (From Samant, M. G., Toney, M. E., et al., Phys. Rev. B. 38 10962...

Figure 10. (A) The resolution of an arbitrary scattering condition, shown as a function of the detector slit size, (2 ). (B) and (C) A rocking scan is measured by scanning resolution function across a specular CTR (B) The surface rod is broader than the transverse resolution, AQt so that the rocking curve width is determined by the intrinsic width of the CTR. (C) The surface rod shape is more narrow than the transverse resolution, Qt, and the shape of the measured rocking curve is resolution limited (i.e., determined by the sht size instead of the intrinsic Une width).

Rocking scans. The reflectivity signal is determined from these data in three general ways. The most quantitative and straightforward method is to measure the reflectivity as a... 

Since the uncertainties in each data point in a rocking scan are determined primarily by counting statistics, the uncertainty of the integrated intensity can also be derived from the uncertainties in the peak width and peak height (Bevington 1969). These uncertainties will be used to determine the uncertainties in the derived interfacial structure. Typically, there is a residual uncertainty in the reflectivity that is difficult to avoid. This uncertainty may be derived, for example, from the uncertainties in any of the prefactors in Equation... 

The rocking scan data in Figure 18 are resolution limited, as indicated by the facts that the rocking scan width in angle space does not vary as a function of Qz, and its magnitude, A0 0.02°, corresponds to one-half the angular size of the detector within the... 

Figure 18. Individual rocking scans for the orthoclase-water interface data shown in Figure 17 at selected values of Qz. Note the same resolution-limited rocking curve shape in each scan. [Data from Fenter et al. (2000).]...

Theta a spectrometer angle in a four-circle spectrometer that is typically used for rocking scans. In Bragg diffraction, this is also the angle of the incident X-ray beam with respect to the Bragg planes. 

Fig. 1.13 Rocking scans through the (0.5, 1, 0.15) reciprocal lattice position measured at 0.4 V in the absence of CO (upper curve) and in the presence of CO (lower curve), where scattering from the commensurate c( /2x2 v/2)R45° structure of the adlayer in 0.1 M HCIO4 + 10 M Br is...

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