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Structure of Kcn Monolayer Films Vapor-Deposited onto Cleaved KBr(001) by Helium Atom Diffraction

Published online by Cambridge University Press:  15 February 2011

S. A. Safron ,
J. R. Baker ,
J. A. Lit ,
E. A. Akhadov ,
T. W. Trelenberg  and
J. G. Skofronick
S. A. Safron
Affiliation:
Department of Chemistry and MARTECH, Florida State University, Tallahassee, FL 32306-3006, safron@chem.fsu.edu
J. R. Baker
Affiliation:
current address, National Research Laboratory, Risø, Denmark, jeff.baker@risoe.dk
J. A. Lit
Affiliation:
Department of Physics and MARTECH, Florida State University, Tallahassee, FL 32306-3016, jaime@scri.fsu.edu, elshan@surf0.martech.fsu.edu, tom@surf0.martech.fsu.edu, skofronick@phy.fsu.edu.
E. A. Akhadov
Affiliation:
Department of Physics and MARTECH, Florida State University, Tallahassee, FL 32306-3016, jaime@scri.fsu.edu, elshan@surf0.martech.fsu.edu, tom@surf0.martech.fsu.edu, skofronick@phy.fsu.edu.
T. W. Trelenberg
Affiliation:
Department of Physics and MARTECH, Florida State University, Tallahassee, FL 32306-3016, jaime@scri.fsu.edu, elshan@surf0.martech.fsu.edu, tom@surf0.martech.fsu.edu, skofronick@phy.fsu.edu.
J. G. Skofronick
Affiliation:
Department of Physics and MARTECH, Florida State University, Tallahassee, FL 32306-3016, jaime@scri.fsu.edu, elshan@surf0.martech.fsu.edu, tom@surf0.martech.fsu.edu, skofronick@phy.fsu.edu.
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Abstract

Angular distribution measurements of the helium atom scattering intensity from monolayer films of KCN/KBr(001) for several azimuths over a temperature range of approximately 40–200 K reveal that above ˜95 K the KCN monolayer forms a (1×1) overlayer structure with respect to the KBr substrate. (The lattice spacing of bulk KCN in the rocksalt-structure phase differs from that of KBr by only ˜ 1%.) Below this temperature the overlayer appears to be (2×1), and “missing” diffraction spots in the <110> high symmetry direction suggest the existence of a glide plane. The inferred structure for this low temperature phase consists of K+ ions fixed in their rocksaltstructure positions relative to the substrate and the CN− ions oriented so that their dipoles are aligned antiferroelectrically within the new unit cell.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 440: Symposia CA – Structure and Evolution of Surfaces , 1996 , 353
Copyright
Copyright © Materials Research Society 1997

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