title: Crystallinity of the double layer of cadmium arachidate films at the water surface.
abstract: A crystalline counterionic layer at the interface between an electrolyte solution and a charged layer of insoluble amphiphilic molecules was observed with grazing incidence synchrotron x-ray diffraction. Uncompressed arachidic films spread over 10(-3) molar cadmium chloride solution (pH 8.8) spontaneously form crystalline clusters with coherence lengths of approximately 1000 angstroms at 9 degrees C. Ten distinct diffraction peaks were observed, seven of which were attributed to scattering only from a crystalline Cd(2+) layer and the other three to scattering primarily from the arachidate layer. The reflections from the Cd(2+) layer were indexed according to a 2 x 3 supercell of the arachidate lattice with three Cd(2+) ions per cadmium unit cell.
authors.forename: F
authors.initials: F
authors.lastname: Leveiller
authors.forename: D
authors.initials: D
authors.lastname: Jacquemain
authors.forename: M
authors.initials: M
authors.lastname: Lahav
authors.forename: L
authors.initials: L
authors.lastname: Leiserowitz
authors.forename: M
authors.initials: M
authors.lastname: Deutsch
authors.forename: K
authors.initials: K
authors.lastname: Kjaer
authors.forename: J
authors.initials: J
authors.lastname: Als-Nielsen