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Laser control of desorption through selective surface excitation
Wayne P Hess1, Alan G Joly, Kenneth M Beck
1Pacific Northwest National Laboratory, P. O. Box 999, Richland, Washington 99352, USA. wayne.hess@pnl.gov
The Journal of Physical Chemistry. B
|July 21, 2006
Summary
Researchers control atom desorption from surfaces using tunable lasers, enabling precise surface modification and atom source generation for chemical studies.
Area of Science:
- Surface Science
- Laser-Induced Processes
- Materials Chemistry
Background:
- Photoinduced desorption is crucial for understanding material-surface interactions.
- Controlling the properties of desorbed species is challenging.
- Alkali halides and metal oxides are important material classes.
Purpose of the Study:
- To review methods for controlling photoinduced desorption of alkali halides.
- To demonstrate tunable laser excitation for controlling halogen atom desorption.
- To extend this control mechanism to metal oxide surfaces.
Main Methods:
- Review of recent developments in photoinduced desorption.
- Selective laser excitation of surface excitons in alkali halides.
- Application of exciton mechanism to magnesium oxide surfaces.
Main Results:
- Tunable laser excitation precisely controls yield, electronic state, and velocity of desorbed halogen atoms.
- Control is achieved via preferential excitation of surface excitons.
- Laser desorption provides a tunable source of atoms for chemical studies.
Conclusions:
- Laser-controlled photoinduced desorption offers precise surface modification.
- The exciton mechanism is applicable to both alkali halides and metal oxides.
- This technique yields well-defined atomic sources for gas-phase and surface chemistry.
