| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Time-Resolved Measurements of the Adsorption/Desorption of Rb Atoms on Octadecyltrichlorosilane Coated Surfaces |
| LIAO Kang-Jia1,2, WANG Mei-Ling1,2, ZHANG Gui-Ying1,2, ZHAO Kai-Feng1,2** |
1Institute of Modern Physics, Department of Nuclear Science and Technology, Fudan University, Shanghai 200433
2Applied Ion Beam Physics Laboratory (Ministry of Education), Fudan University, Shanghai 200433
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| Cite this article: |
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LIAO Kang-Jia, WANG Mei-Ling, ZHANG Gui-Ying et al 2015 Chin. Phys. Lett. 32 076801 |
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Abstract We carry out the first time-resolved measurement of Rb atoms desorbing from octadecyltrichlorosilane coated surfaces by polarizing the atoms near the surface using an evanescent wave pump pulse and watching the subsequent intensity change of another evanescent wave probe beam, and find the mean adsorption (dwell) time to be about 400 ns at a cell body temperature of 112°C. The adsorption energy is found to be 0.19 eV from the surface temperature dependence of the adsorption time. This method can be extended to study the adsorption/desorption process of other alkali atoms on other surfaces of transparent substrates with an ultimate time resolution limited by the flight time of atoms in the evanescent wave which is of the order of nanoseconds.
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Received: 20 April 2015
Published: 30 July 2015
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| PACS: |
68.43.Nr
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(Desorption kinetics)
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32.80.Xx
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(Level crossing and optical pumping)
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42.25.Gy
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(Edge and boundary effects; reflection and refraction)
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