Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session M66: Surface and Interface Physics: Growth, Characterization and Properties
8:00 AM–11:00 AM,
Wednesday, March 16, 2022
Room: Hyatt Regency Hotel -Grant Park D
Chair: Ryan Comes, Auburn University
Abstract: M66.00014 : Measuring physisorption well depth with fast atom scattering
10:36 AM–10:48 AM
Presenter:
Peng Pan
(ISMO, CNRS Université Paris Saclay, France)
Authors:
Peng Pan
(ISMO, CNRS Université Paris Saclay, France)
philippe roncin
(ISMO, CNRS Université Paris Saclay, France)
The use of fast atom scattering on the surface appears counter-intuitive because the atoms have kinetic energy on the order of a keV.
However, under grazing incidence, a very strong decoupling has been demonstrated so that the effective energy governing the interaction with the surface is given by that of the motion perpendicular to the surface which can be brought to the ten's of meV range [1].
Four different manifestations of the well-depth have been observed with fast atom scattering.
-1) Observing resonances associated with the bound states inside the potential well [2].
-2) Comparing diffracted intensities with an exact quantum scattering calculation [3].
-3) Measuring the rainbow scattering angle and interpreting its evolution as a refraction effect due to the attractive forces [3]. No diffraction is required and we have extended the technique to heavier noble gazes up to Xe.
-4) Measuring the sharp increase of the width of the inelastic polar profile due to the attractive forces. We have derived a model based on Morse's potential to link the observation to the well-depth [4] even without crystalline order.
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700