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Delayed release of Li atoms from laser ablated lithium niobate

AuthorsChaos, J. A.; Dreyfus, R. W.; Perea, Ángel ; Serna, Rosalía ; Gonzalo de los Reyes, José; Afonso, Carmen N.
KeywordsLithium compounds
Piezoelectric thin films
Laser ablation
Pulsed laser deposition
Atomic absorption spectroscopy
Issue Date31-Jan-2000
PublisherAmerican Institute of Physics
CitationApplied Physics Letters 76(5): 649 (2000)
AbstractThe present vapor-phase optical (atomic) absorption measurements study the escape dynamics of Li atoms from a LiNbO3 target surface upon laser ablation in vacuum. The objective is to understand the low-Li content of LiNbO3 films prepared by pulsed laser deposition. A primary result is a delayed release of Li atoms, 2–20 µs after the laser pulse; they eject with a velocity of 6×105 cm s–1, which is consistent with an electronic ejection mechanism. The long emission period means there are almost no intraplume Li collisions in the gas phase and no forward focusing of the delayed released atoms. This appears to explain the low-Li content usually found in films grown in the normal direction.
Description3 pages, 3 figures.-- PACS: 79.20.Ds; 81.15.Fg; 77.84.Dy; 82.80.Ch
Publisher version (URL)http://dx.doi.org/10.1063/1.125847
Appears in Collections:(CFMAC-IO) Artículos
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