Dynamics of laser ablation plume penetration through low pressure background gases
- Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6056 (United States)
- Institute of Spectroscopy, Russian Academy of Sciences, Troitsk (Russian Federation)
The dynamics of laser-ablated yttrium plume propagation through background argon have been investigated with fast time- and spatially-resolved plasma diagnostics in order to characterize a general phenomenon believed to be important to film growth by pulsed laser deposition (PLD). During expansion into low-pressure background gases, the ion flux in the laser ablation plasma plume is observed to split into fast and slow components over a limited range of distances including those typically utilized for PLD. Optical absorption and emission spectroscopy are employed to simultaneously identify populations of both excited and ground states of Y and Y{sup +}. These are correlated with intensified-CCD (ICCD) photographs of visible plume luminescence and ion fluxes recorded with fast ion probes. These measurements indicate that plume-splitting in background gases is consistent with scattering of target constituents by ambient gas atoms. The momentum transfer from these collisions produces a transition from the initial, ``vacuum`` velocity distribution into a velocity distribution which is significantly slowed in accordance with shock or drag propagation models. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 69436
- Journal Information:
- Applied Physics Letters, Vol. 67, Issue 2; Other Information: PBD: 10 Jul 1995
- Country of Publication:
- United States
- Language:
- English
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