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Physical Review A

Comment on “Light-induced atomic desorption and diffusion of Rb from porous alumina”

Krzysztof Rębilas

Published Nov 29, 2010• 1 citation
Publisher

Abstract

In a recent article [Phys. Rev. A 81, 032901 (2010)] a theory of light-induced atomic desorption for Rb in porous alumina is proposed. We point out that both the main assumption of this theory (the diffusion inside the pores treated as a random walk with the adsorption to the inner surface of the pores at any step) and several further hypotheses supporting the theoretical model require a revision.

DOI
10.1103/physreva.82.056901

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Reply to Comment on Light-induced atomic desorption and diffusion of Rb from porous alumina

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We argue that the model used in our paper [Phys. Rev. A 81, 032901 (2010)] for the analysis of the experimental study of light-induced atomic desorption in porous alumina is the simplest consistent approach to a previously unexplored physical system.

Physical Review A•Nov 29, 2010•1 citation

Light-induced atomic desorption and diffusion of Rb from porous alumina

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We present a study of light-induced atom desorption (LIAD) of an alkali-metal atom (Rb) in porous alumina. We observe the variation due to LIAD of the rubidium density in a vapor cell as a function of illumination time, intensity, and wavelength. The simple and regular structure of the alumina pores allows a description of the atomic diffusion in the porous medium in which the diffusion constant only depends on the known pore geometry and the atomic sticking time to the pore wall. A simple one-dimensional theoretical model is presented which reproduces the essential features of the observed signals. Fitting of the model to the experimental data gives access to the diffusion constant and consequently the atom-wall sticking time and its dependence on light intensity and wavelength. The nonmonotonic dependence of the LIAD yield on the illumination light frequency is indicative of the existence of Rb clusters in the porous medium.

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Publisher’s Note: Comment on “Light-induced atomic desorption and diffusion of Rb from porous alumina” [Phys. Rev. A82, 056901 (2010)]

Krzysztof Rębilas

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Huge light-induced rubidium atom desorption has been observed from porous silica samples placed inside Pyrex cells kept at room temperature. The desorption rate and the maximum vapour density change have been measured as a function of the desorbing light intensity. Their values are comparable with those recently obtained in Pyrex cells coated with organic films. A linear dependence of the desorption rate and a square-root dependence of the maximum density increase on light intensity indicate that diffusion inside the glass pores is a key mechanism. The application of this effect to develop light-controlled atomic dispensers compatible with high vacuum environment is discussed.

Europhysics Letters (EPL)•Sep 1, 2004•38 citations
In a recent article [Phys. Rev. A 81, 032901 (2010)] a theory of light-induced atomic desorption for Rb in porous alumina is proposed. We point out that both the main assumption of this theory (the diffusion inside the pores treated as a random walk with the adsorption to the inner surface of the pores at any step) and several further hypotheses supporting the theoretical model require a revision.
We present a study of light-induced atom desorption (LIAD) of an alkali-metal atom (Rb) in porous alumina. We observe the variation due to LIAD of the rubidium density in a vapor cell as a function of illumination time, intensity, and wavelength. The simple and regular structure of the alumina pores allows a description of the atomic diffusion in the porous medium in which the diffusion constant only depends on the known pore geometry and the atomic sticking time to the pore wall. A simple one-dimensional theoretical model is presented which reproduces the essential features of the observed signals. Fitting of the model to the experimental data gives access to the diffusion constant and consequently the atom-wall sticking time and its dependence on light intensity and wavelength. The nonmonotonic dependence of the LIAD yield on the illumination light frequency is indicative of the existence of Rb clusters in the porous medium.
Huge light-induced rubidium atom desorption has been observed from porous silica samples placed inside Pyrex cells kept at room temperature. The desorption rate and the maximum vapour density change have been measured as a function of the desorbing light intensity. Their values are comparable with those recently obtained in Pyrex cells coated with organic films. A linear dependence of the desorption rate and a square-root dependence of the maximum density increase on light intensity indicate that diffusion inside the glass pores is a key mechanism. The application of this effect to develop light-controlled atomic dispensers compatible with high vacuum environment is discussed.