Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/24788
Title: Evidence of chemical reactions in the hydroxyapatite laser ablation plume with a water atmosphere
Author: Serra Coromina, Pere
Morenza Gil, José Luis
Keywords: Reaccions químiques
Materials biomèdics
Pel·lícules fines
Làsers
Chemical reactions
Biomedical materials
Thin films
Laser
Issue Date: 15-Mar-1999
Publisher: American Institute of Physics
Abstract: The expansion dynamics of the ablation plume generated by KrF laser irradiation of hydroxyapatite targets in a 0.1 mbar water atmosphere has been studied by fast intensified charge coupled device imaging with the aid of optical bandpass filters. The aim of the filters is to isolate the emission of a single species, which allows separate analysis of its expansion. Images obtained without a filter revealed two emissive components in the plume, which expand at different velocities for delay times of up to 1.1 ¿s. The dynamics of the first component is similar to that of a spherical shock wave, whereas the second component, smaller than the first, expands at constant velocity. Images obtained through a 520 nm filter show that the luminous intensity distribution and evolution of emissive atomic calcium is almost identical to those of the first component of the total emission and that there is no contribution from this species to the emission from the second component of the plume. The analysis through a 780 nm filter reveals that atomic oxygen partially diffuses into the water atmosphere and that there is a contribution from this species to the emission from the second component. The last species studied here, calcium oxide, was analyzed by means of a 600 nm filter. The images revealed an intensity pattern more complex than those from the atomic species. Calcium oxide also contributes to the emission from the second component. Finally, all the experiments were repeated in a Ne atmosphere. Comparison of the images revealed chemical reactions between the first component of the plume and the water atmosphere.
Note: Reproducció del document publicat a: http://dx.doi.org/10.1063/1.369673
It is part of: Journal of Applied Physics, 1999, vol. 85, núm. 6, p. 3289-3293
Related resource: http://dx.doi.org/10.1063/1.369673
URI: http://hdl.handle.net/2445/24788
ISSN: 0021-8979
Appears in Collections:Articles publicats en revistes (Física Aplicada)

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