Scanning Photoemission Microscopy of Tribological Surfaces
Abstract
We are in the process of investigating tribological surfaces with a scanning photoemission microscope at the National Synchrotron Light Source in order to determine the distribution and chemical state of various elements in a wear-scar. We have mapped the distribution of elements such as Zn, Fe, Ni, and Mo for samples created with a Mo containing reference lubricant, and have found considerable variations inside a wear scar. Point XPS spectra also show considerable differences in the lines shapes for the Mo 3d peak and indicate that the oxidations state of Mo varies. - The scanning photoemission microscope has recently been moved to a new dedicated branchline at beamline X1A that is presently being commissioned. The new beamline is expected to reduce chromatic aberrations of the zone plate that presently limit the spatial resolution to about 250 nm. Even with present day zone plates a spatial resolution of 100 nm should be possible with photon energies as high as 750 eV. The new beamline will also improve the energy resolution and should allow us to determine the Mo chemical species present on the surface. We expect to present results obtained with the new beamline setup. Work supported by: NSF Young Investigator Award (DMR-9458060) and EXXON Research and Engineering
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 1997
- Bibcode:
- 1997APS..MAR.D4103Z