Critical phenomena at the surface: a glancing angle X-ray scattering study

Synchrotron X-Ray Scattering from the Al(110) Surface at the Onset of Surface Melting

“…Consider now a surface with a roughness described by the height-height correlation function (h(0) h(rll)) and a disordered surface layer of effective thickness L ( T ) = p ( T ) a, (a, is the appropriate lattice constant and p( T ) an integer number). For the associated evanescent Bragg scattering one gets [6,8] I J'B(Q: , T >/ (TT Ti)?…”

“…lb)). The full line is the result of a least-squares fit using the DWBA Bragg scattering cross-section (see also [8]) giving again an average surface curvature of Ane = (0.48 2 0.04) mrad, a room temperature surface roughness ,c = (10 2 2) A and a misalignment of the (002) Bragg planes with respect to the surface of A$ = -2.4 mrad. The in-plane near-surface mosaicity was measured to be Awl, = 0.10'.…”