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

1996 ◽  
Vol 440 ◽  
Author(s):  
S. A. Safron ◽  
J. R. Baker ◽  
J. A. Lit ◽  
E. A. Akhadov ◽  
T. W. Trelenberg ◽  
...  
Keyword(s):  
Helium Atom ◽  
Temperature Phase ◽  
High Symmetry ◽  
Monolayer Films ◽  
Symmetry Direction ◽  
Helium Atom Scattering ◽  
Atom Scattering ◽  
Rocksalt Structure ◽  
High Symmetry Direction ◽  
Low Temperature Phase

AbstractAngular 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.

THE SATURATED (3 × 3)-H/Cu(111) SYSTEM: A STRUCTURAL STUDY USING MEDIUM-ENERGY ION SCATTERING AND HELIUM ATOM SCATTERING

2007 ◽  
Vol 14 (06) ◽  
pp. 1191-1198 ◽  
Author(s):  
I. G. SHUTTLEWORTH
Keyword(s):  
Helium Atom ◽  
Cross Section ◽  
Atomic Hydrogen ◽  
High Symmetry ◽  
Medium Energy ◽  
Ion Scattering ◽  
Helium Atom Scattering ◽  
Atom Scattering ◽  
System A ◽  
Medium Energy Ion Scattering

The adsorption of atomic hydrogen on Cu (111) has been studied using the techniques of helium atom scattering (HAS) and medium-energy ion scattering (MEIS). Ion scattering investigations of the saturated (3 × 3)- H / Cu (111) system indicate that no reconstruction of the Cu substrate exists along the high symmetry directions of the surface. The HAS hydrogen cross-section for H / Cu (111) has been determined to be (12.5 ± 2.5 Å2). The symmetry of the HAS diffraction pattern shows that the (3 × 3)- H / Cu (111) system is formed of a single domain structure.

scholarly journals Inter-adsorbate forces and coherent scattering in helium spin-echo experiments

2021 ◽  
Author(s):  
David J. Ward ◽  
Arjun Raghavan ◽  
Anton Tamtögl ◽  
Andrew P. Jardine ◽  
Emanuel Bahn ◽  
...  
Keyword(s):  
Helium Atom ◽  
Short Range ◽  
Spin Echo ◽  
Coherent Scattering ◽  
Helium Atom Scattering ◽  
Atom Scattering

Using helium atom scattering to identify adsorbate interactions and separate the effects of long and short range forces.

Low energy helium atom scattering from HCl monolayers physisorbed on graphite

1989 ◽  
Vol 224 (1-3) ◽  
pp. A620
Author(s):  
G.Y. Liu ◽  
P. Rowntree ◽  
G. Scoles ◽  
J. Xu
Keyword(s):  
Helium Atom ◽  
Low Energy ◽  
Helium Atom Scattering ◽  
Atom Scattering

A helium atom scattering study of the structure and phonon dynamics of the ice surface

2000 ◽  
Vol 112 (24) ◽  
pp. 11011-11022 ◽  
Author(s):  
A. Glebov ◽  
A. P. Graham ◽  
A. Menzel ◽  
J. P. Toennies ◽  
P. Senet
Keyword(s):  
Helium Atom ◽  
Helium Atom Scattering ◽  
Atom Scattering ◽  
Ice Surface ◽  
Phonon Dynamics ◽  
Scattering Study

scholarly journals Study of energy transfer in helium atom scattering from surfaces

Vacuum ◽  
1999 ◽  
Vol 54 (1-4) ◽  
pp. 315-320 ◽  
Author(s):  
A. Šiber ◽  
B. Gumhalter ◽  
J.P. Toennies
Keyword(s):  
Energy Transfer ◽  
Helium Atom ◽  
Helium Atom Scattering ◽  
Atom Scattering

Surface vibrations of large water clusters by helium atom scattering

2000 ◽  
Vol 112 (24) ◽  
pp. 11038-11047 ◽  
Author(s):  
Jesko Brudermann ◽  
Petra Lohbrandt ◽  
Udo Buck ◽  
Victoria Buch
Keyword(s):  
Helium Atom ◽  
Water Clusters ◽  
Helium Atom Scattering ◽  
Atom Scattering ◽  
Surface Vibrations ◽  
Large Water
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