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Figure 14
Schematic illustrations of possible approaches to implement TXS measurements on a flat, horizontal liquid surface. (a) A vertical scattering approach based on a Bragg crystal (X) that deflects a horizontal incoming beam upward, with the Bragg angle [\theta_{\rm B}] satisfying [2\theta_{\rm B}] [\approx] 90°. (b) An alternative approach based on the coupling of the vertical scattering geometry to a liquid-surface diffractometer (LSD). Here, the first crystal (X1), part of the LSD, steers the beam to control the angle α to the horizontal (gravity-normal) plane; the second crystal (X2), mounted at the LSD's `sample' position, deflects the beam from X1 upward towards the liquid surface, satisfying [2\theta_{\rm B} - \alpha] [\approx] 90°.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 23| Part 2| March 2016| Pages 519-531
doi:10.1107/S1600577515023103
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