Laser Desorption from Metal Oxides
EMSL Project ID
24794
Abstract
This proposal is a continuation of research under EMSL User Proposal #21794. Laser ablation and desorption techniques form the basis of unique methods for producing novel materials, performing sophisticated chemical analysis or medical procedures. Although laser ablation/desorption techniques are utilized extensively across a diverse range of disciplines, detailed mechanistic understanding has proved elusive due to the inherent complexity of the initial laser solid interaction and subsequent particle emission processes. The primary laser absorption may occur through linear or nonlinear mechanisms and through intrinsic or extrinsic photo-centers; further complications are introduced by the many-bodied dynamics that ultimately lead to particle emission. Many of the key processes (i.e. electron-hole recombination, trapping, exciton relaxation, electron/phonon interactions, etc.) occur on a sub-nanosecond time-scale and femtosecond laser studies are needed to clarify the role of ultrafast phenomena involved in laser desorption processes. To obtain detailed understanding of highly complex laser desorption processes, a combined experimental and theoretical effort is essential.An additional important aspect of this work is determining ultrafast excited electronic state dynamics of wide-band materials. These include processes such as small polaron formation at interfaces between conductors and insulators. To this end we will utilize the XPS interfaced with ultrasfast lasers.
Project Details
Project type
Large-Scale EMSL Research
Start Date
2007-05-29
End Date
2010-09-30
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members
Related Publications
Energy and site selectivity in O-atom photodesorption from nanostructured MgO
Beck KM, AG Joly, O Diwald, S Stankic, PE Trevisanutto, PV Sushko, AL Shluger, and WP Hess. 2008. "Energy and Site Selectivity in O-Atom Photodesorption from Nanostructured MgO." Surface Science 602(11):1968-1973. doi:10.1016/j.susc.2008.03.046