Collisional effects of background gases on pulsed laser deposition plasma beams

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The penetration of energetic pulsed ablation plumes through ambient gases is experimentally characterized to investigate a general phenomenon believed to be important to film growth by pulsed laser deposition (PLD). Under typical PLD conditions involving background gases, the ion flux in the ablation plume is observed to split into distinct fast and slow components over a limited range of distances. The fast component is transmitted with near-initial velocities and high kinetic energies, potentially damaging to growing films at these distances. Formation of the second, significantly-slowed component correlates with the bright contact front formation observed in fast ICCD imaging studies. This ... continued below

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7 p.

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Geohegan, D. B. & Puretzky, A. A. April 1995.

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  • Geohegan, D. B. Oak Ridge National Lab., TN (United States)
  • Puretzky, A. A. Russian Academy of Sciences, Troitsk (Russian Federation). Institute of Spectroscopy

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Description

The penetration of energetic pulsed ablation plumes through ambient gases is experimentally characterized to investigate a general phenomenon believed to be important to film growth by pulsed laser deposition (PLD). Under typical PLD conditions involving background gases, the ion flux in the ablation plume is observed to split into distinct fast and slow components over a limited range of distances. The fast component is transmitted with near-initial velocities and high kinetic energies, potentially damaging to growing films at these distances. Formation of the second, significantly-slowed component correlates with the bright contact front formation observed in fast ICCD imaging studies. This general effect is explored in detail for the case of yttrium ablation into argon, a single-element target into an inert gas. Time-resolved optical absorption spectroscopy and optical emission spectroscopy are employed to simultaneously view the populations of both excited and ground states of Y and Y{sup +} for comparison with quantitative intensified-CCD photography of the visible plume luminescence and ion flux measurements made with fast ion probes during this phenomenon. These measurements confirm that, in addition to the bright significantly-slowed front which has been described by shock or drag propagation models, a fast-component of target material is transmitted to extended distances for some ambient pressures with near-initial velocities.

Physical Description

7 p.

Notes

OSTI as DE95013986

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  • Spring meeting of the Materials Research Society (MRS), San Francisco, CA (United States), 17-21 Apr 1995

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  • Other: DE95013986
  • Report No.: CONF-950412--22
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 82407
  • Archival Resource Key: ark:/67531/metadc783171

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  • April 1995

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  • Dec. 3, 2015, 9:30 a.m.

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  • Jan. 25, 2016, 3:53 p.m.

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Geohegan, D. B. & Puretzky, A. A. Collisional effects of background gases on pulsed laser deposition plasma beams, article, April 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc783171/: accessed August 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.