title: Structural study of new hydrocarbon nano-crystals by energy-filtered electron diffraction.
abstract: A new brittle hydrocarbon has been successfully synthesized in polycrystalline form, and its crystal structure solved by quantitative electron diffraction. By 3D tilting of the nano-crystals, the lattice type and unit cell parameters were determined. (Triclinic, [Formula: see text] A, [Formula: see text] A, [Formula: see text] A, [Formula: see text] degrees, [Formula: see text] degrees, and [Formula: see text] degrees.) Spot diffraction patterns were obtained at -165 degrees C using the Koehler selected-area mode on a LEO 912 TEM fitted with an omega in-column elastic energy filter. The direct methods algorithm was then applied to merged intensities and a trial structure obtained assuming single scattering. This was further refined to obtain good agreement with a small residual of about 10% using multiple scattering calculations. A diagram of the proposed structure is given.
authors.affiliation: Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85287-1504, USA.
authors.forename: J S
authors.initials: JS
authors.lastname: Wu
authors.forename: N
authors.initials: N
authors.lastname: Melcer
authors.forename: W P
authors.initials: WP
authors.lastname: Sharp
authors.forename: M
authors.initials: M
authors.lastname: O'Keeffe
authors.forename: J C H
authors.initials: JC
authors.lastname: Spence
authors.forename: O M
authors.initials: OM
authors.lastname: Yaghi