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Proceedings Paper

Light-induced atomic desorption: recent developments
Author(s): E. Mariotti; S. N. Atutov; Valerio Biancalana; S. Bocci; A. Burchianti; C. Marinelli; K. A. Nasyrov; B. Pieragnoli; L. Moi
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Paper Abstract

Light induced atomic desorption (LIAD) is an impressive manifestation of a new class of phenomena involving alkali atoms, dielectric films and light. LIAD consists of a huge emission of alkali atoms (experimentally proved for sodium, potassium, rubidium and cesium) from siloxane films when illuminated by laser or ordinary light. Most of the experiments have been performed in glass cells suitably coated by a thin film (of the order of 10 micrometer) either of poly - (dimethylsiloxane) (PDMS), a polymer, or of octamethylcyclotetrasiloxane (OCT), a crown molecule. LIAD is a combination of two processes: direct photo-desorption from the surface and diffusion within the siloxane layer. The photo-desorbed atoms are replaced by fresh atoms diffusing to the surface. Moreover, from the experimental data it comes out that the desorbing light increases atomic diffusion and hence the diffusion coefficient. To our knowledge this is the first time that such an effect is clearly observed, measured and discussed: LIAD represents a new class of photo-effects characterized by two simultaneous phenomena due to the light: surface desorption and fastened bulk diffusion.

Paper Details

Date Published: 9 April 2001
PDF: 5 pages
Proc. SPIE 4397, 11th International School on Quantum Electronics: Laser Physics and Applications, (9 April 2001); doi: 10.1117/12.425139
Show Author Affiliations
E. Mariotti, INFM and Univ. di Siena (Italy)
S. N. Atutov, Institute of Automation and Electrometry (Russia)
Valerio Biancalana, INFM and Univ. di Siena (Italy)
S. Bocci, INFM and Univ. di Siena (Italy)
A. Burchianti, INFM and Univ. di Siena (Italy)
C. Marinelli, INFM and Univ. di Siena (Italy)
K. A. Nasyrov, Institute of Automation and Electrometry (Russia)
B. Pieragnoli, INFM and Univ. di Siena (Italy)
L. Moi, INFM and Univ. di Siena (Italy)


Published in SPIE Proceedings Vol. 4397:
11th International School on Quantum Electronics: Laser Physics and Applications
Peter A. Atanasov; Stefka Cartaleva, Editor(s)

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