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• W2037013111 abstract "Na atoms have been observed on top of inert spacer layer/metal substrates at room temperature in an ultrahigh-vacuum environment via two-photon laser-induced fluorescence. As spacers, 1, 5, and 11 cadmium-arachidate (LB) and single dodecanthiol (SAM) layers were used, thereby changing the distance between atom and metal between 26 and 290 Å. A low sticking probability (≪10−6) was observed, resulting in a coverage of the spacer layers with less than 10−3 of a monolayer Na. This low coverage is due to the low binding energy of Na at the CH3 end groups of the spacers (millielectron volts). The Na intensity showed a biexponential decay as a function of time with a small time constant (40 s) due to direct evaporation of Na adsorbed on top of the layers and a large time constant (650 s) due to diffusion of the Na atoms through the fatty acid layers. The two-photon detection scheme allowed a Doppler-free (high-resolution) measurement of line broadening and frequency shift of the spectral lines due to the presence of the metal surface. A moderate broadening was observed for Na on top of LB multilayers on Pt/mica substrates, denoting that the Na atoms diffuse through the fatty acid chains with their mean distance from the surface decreasing from 290 to 28 Å. In addition, we found a red shift of the spectral lines by a few hundred Megahertz. The results are compared with previous data of sticking and line broadening of Na on a SAM/Au/Si substrate." @default.
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• W2037013111 date "1993-05-01" @default.
• W2037013111 modified "2023-10-16" @default.
• W2037013111 title "Laser investigation of Na atoms deposited via inert spacer layers close to metal surfaces" @default.
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• W2037013111 doi "https://doi.org/10.1063/1.464703" @default.
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