Download PDF by Barus C.: Acoustic Pressures in Case of Soap Bubbles

By Barus C.

Show description

Read or Download Acoustic Pressures in Case of Soap Bubbles PDF

Best physics books

Additional info for Acoustic Pressures in Case of Soap Bubbles

Example text

As shown in Fig. 7, such surfaces, also called high index surfaces, show a periodic succession of terraces and steps of monoatomic height. Although they can be specified by their corresponding Miller indices [(557) in Fig. 7b], this notation is not very convenient since it does not indicate, at first sight, the geometrical structure. We will, rather, use a notation introduced by Lang et al. 8]: [p(lmn) x (l'm'n')] in which [mn and ['m'n' are, respectively, the Miller indices of the terraces and of the ledges and p gives the number of atomic rows in the terrace parallel to the edge.

Finally, we also describe some other techniques (photoelectron diffraction, surface extended X-ray absorption fine structure) from which structural information can be deduced. 1 Two-Dimensional Lattices One of the symmetry transformations allowing us to generate two-dimensional periodic structures is translation (Fig. 2). The transformation T = na + mb n, m = 0, ± 1, ± 2, ... connects the origin to a geometrically equivalent site and an infinite twodimensional lattice is thus obtained. The parallelogram with sides a and b is called the primitive or unit cell.

The other symmetry transformations are: - rotational symmetry with an angle ¢ = 2n/n (n = 1,2,3,4,6), n = 5 being forbidden, at least for perfectly periodic structures. - reflection symmetry across a line. 1 Surface Crystallography 45 Adatom Kink Advacancy Ledge Fig. 1. TLK model • • • • i • Fig. 2. Two-dimensional unit cell These different point operations yield ten two-dimensional crystallographic point groups. There are only five possible two dimensional lattices: the five Bravais lattices, drawn in Fig.

Download PDF sample

Acoustic Pressures in Case of Soap Bubbles by Barus C.

by Richard

Rated 4.46 of 5 – based on 21 votes