Photo-atomic effect: Temperature dependence of the photodesorption of Na and from polymer surfaces |
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| Authors: | J.H. Xu F. Mango G. Alzetta R.A. Bernheim |
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| Affiliation: | (1) Scuola Normale Superiore and INFM, Piazza dei Cavalieri 7, 56100 Pisa, Italy, IT;(2) INFM and Department of Physics, Via F. Buonarroti 2, 56100 Pisa, Italy, IT;(3) Department of Chemistry, The Pennsylvania State University, 152 Davey Laboratory, University Park, PA 16802, USA, US |
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| Abstract: | Alkali metals adsorbed to surface films of the polymer poydimethylsiloxane (PDMS) have been shown to exhibit a unique photodesorption behavior, characterized by a frequency threshold and high efficiency. In this work, the temperature dependence of the photodesorption yields of Na and Na 2 from PDMS surfaces were measured between room temperature and 183 K. Over most of the temperature range, the yields exhibited an Arrhenius behavior characterized by thermal activation energies of 0.36 eV and 0.34 eV for Na and Na 2 , respectively. These values are suggestive of a surface diffusion as one of the elementary steps in the photodesorption mechanism. Moreover, the similarity of the two values indicates that the same elementary step applies to the desorption of both Na and Na 2 . Received 23 April 1999 and Received in final form 15 July 1999 |
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| Keywords: | PACS. 34.50.Dy Interactions of atoms, molecules, and their ions with surfaces photon and electron emission neutralization of ions - 79.20.La Photon- and electron-stimulated desorption |
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